I don’t think there is anything really that she should do. Her rabbit *may* be pregnant-if it was ever exposed to a male rabbit and both were unaltered. Even if they are supervised it takes seconds to mate.
It also may be having a false pregnancy. This can happen to unspayed females who bred but didn’t ‘catch’ and it can happen if they *think* they are pregnant-whether it’s a horomonal fluctuation or if they were spayed and bred, but aren’t pregnant.
I really don’t think this is a medical emergency at all. If she/he were to post, it’s fine-no one here would be mean! But that’s sweet of you to post for the member and get help for them
If it were me, just keep an eye, watch for babies-if unspayed female. Sometimes it can look like a pile of fur but there are babies in there. You can handle babies from birth so if the female is unspayed, they can just put their hand in the pile of fur to check.