Surprisingly she doesn’t seem to have much trouble handling the heavy container and even manages to get it through a couple of doors where it only has an inch at most of space to spare.
She leaves the wheeled container for a moment and then returns with a long hose before pushing the container down a corridor. She eventually parks it outside a wooden door and there she takes the lid off.

“Odd, so supposedly you girls are still you.” Rita tells the white fluid that’s occupying the container. “I don’t know if this is good or bad news, but I found you to be absolutely delicious. Which is why I decided that I’m going to drink you all up.” She then stepped up on the bottom ridge of the container, it was really meant to support the container's bottom to make it sturdier, but it also serves as a good footstep for when you want to reach inside the container, especially if you are short, or in this case if you want your belly to be visible above the edge of the container. “I’m not sure if you can see in your present state either, but I figured I’d give you a view of where you are going.” Rita said and rubbed her toned tummy. “I can’t wait any longer so I’ll get right too it.”

She jumped down and threw one end of the hose into the tub looking over the edge again, making sure it ended up at the bottom and looked like it'd stay there. “Oh and if you wonder why we stopped here in the middle of a hallway it’s because, well there’s quite a bit of you and you’re liquid and liquid tends to pass through rather quickly so to speak.” Rita giggled.

That was the last they’d see of Rita before seeing her on the inside. The door opened up to a small bathroom and Rita left the door open as she took the remaining hose with her inside and seated herself on the toilet. Rita put the tube to her lips and began to suck hoping it’d work like a straw and that it wouldn’t dislodge itself from the container outside.

No it worked alright, Anna’s rich creamy milk filled her mouth, she savoured the first mouthful, but the continuous flow and the sheer volume meant that she really didn’t need to put extra effort on that part, unless she’d shove the tube into her throat her taste buds would be continuously assaulted by the wonderful flavours of the milk, at least as long as she kept sucking and that she did. In fact she kept sucking harder and harder she was soon draining that container much faster than that machine ever did Anna’s breasts.

The girls that are the milk finds themselves at first flowing and then rushing down Rita’s lovely throat and into her stomach. Since they are already liquefied it doesn’t keep them, but instead hands them over to Rita’s greedy intestines. Her intestines are like dry sponges on the poor girls flowing into them, it doesn’t help that they are so long either, the first girl worth of milk is gone before even getting five feet into her small intestine, meaning that when the last of the girls has finally been drained out of the tub and made it into Rita’s intestines it doesn’t look like they’ll ever even reach her large intestine.
They do however, but at that time there sure isn’t much left of them, just a few liters actually and with all her large intestine to go things doesn’t look too good for the ladies.
It is specialized in retaining liquid from meals and so the remains of the girls diminish until they are all but gone. There isn’t much solid waste from liquid foods, not even as rich ones as this, at least not if it has to pass through a digestive tract like Rita’s.
However, by now Rita’s bladder is quite full, so she stops holding things in when she realizes she’s done digesting the girls and sighs contently as she relieves herself.

"Heh, not much analyzing done, but flavour and digestability is well worth investigating, no?" Rita laughs to herself as she roll away the container to have all items she's used cleaned. It's an easy and quick task, but once done she puts the things away muttering too herself: "Hmm, isn't breastmilk dairy too...?" Eager to see whether her suspicion is correct or not Rita rushes back to the test subject holding area and finds that all the milk-girls have indeed not reformed, just as all previous tests have shown involving dairy products.

Other than that...