She might be pregnant. It will be a lot for her body to take if she is, but she will likely be fine.
Don’t worry about the kits not getting food - it’s really not a wise battle to try to feed a baby bun this young yourself. It takes constant care and then eventually you have to feed them rabbit cecotrophes which is difficult. The frustration will likely be met with failure anyway.
Full bellies is good - not worrying on your part is the main goal!
Rabbits have no natural defenses - only to make a heck of a lot of babies. They do it well. Only 30% or so of wild buns make it through each winter so they have adapted by having large healthy litters and playing the numbers game!