I have to agree with the others who say that choosing to feed off a mother rat because she buried her young is a bit harsh.
However, I know the history you've had with this particular rat. The first litter where most of them died. The chewing problem. So I don't question your choice to feed her off at all. It just seems a bit odd that the final straw is something that seems like a good sign.
I'd love to hear how the "adoption" with Doe and these babies is going. Please give us an update.
Also, in your original post in this thread you asked if you should try to keep any of the babies from this litter. If I remember correctly, you've had trouble getting your breeding program going due to not finding any good stock locally. So these ones might be better than other options available to you and at least it will give you more genetic variety than if you only keep Doe's offspring. You could always feed off Gazelle's entire line if you see any problems when her babies start being mothers.