Two female rabbits and the one is always angry?

I have two female rabbits that are the same age and bought and raised together and always seemed to get on well. The past month the one rabbit bonnie seems to be biting me all the time if I go near her or making like a grunty wheezing noise. She also tends to chase thumper if she gets close to her and pulls some of her fur out. A few weeks before she was humping her, which I no can be the dominance thing. They will be one in june and as soon as I finish uni I intend to get them both spayed. Do you think this will help ? Bonnie always used to be the most friendly its like shes turned evil it's upsetting :( because I don't no what to do? also do they prefer not to be picked up ? Before I bought them I did my homework on them and thumpers lovely :) they do seem to prefer to watch rather than play with humans :/ now