Might have to get her a new boyfriend, it might seem soon but I don't like any of them on their own
I know exactly how you feel. Millie was on her own for just over 2 weeks when Billy died, she seemed to cope pretty well on her own but I know I'm no substitute for another bunny. I feel bad as I haven't warmed to Ko yet, and I keep calling him Billy I know I'll love him some time soon but at the moment I just miss Billy and have realised what a good pairing he and Millie were.
Good luck if/when you get another husbun for your little girl, you'll know if she's coping or not on her own and if not, maybe you'll have to find a new bunny sooner rather than later.