Is she doing this when food arrives? Or do they compete for a favourite hidey-house or litterbox even? Is there a certain time of day you notice when she is acting out, or is there no real pattern. Is it mainly when you are about, or your husband? Or it makes no difference who is present? Are either of you regularly around other pets when away from your home?
I mentioned a possible hidden health issue in my first reply, but sometimes it can be another rabbits health condition that causes some unusual behaviour in the healthy one. For instance, if one had a urinary issue and had a different smell about them, their bond mate may not react the same toward them. I really think they rely on their sense of smell a lot!
I had a trio of bunnies a few years back and one of the girls became ill with head-tilt. I had to take her out of the trio for some weeks to nurse her. As she got better, I tried to keep letting her have interactions with the other 2, which she was really looking for. She was quite thin and incontinent for a while but she was craving bunny company. The boy acted completely fine with her and lay next to her etc, but the girl (her daughter!) was less so. It took a little while for their bond to come back to what it had been before illness.