Obviously they aren’t getting along…. that is abundantly clear. What you should do if you’re going to have rabbits is spend more time looking into when it is appropriate to introduce two rabbits.

They are acting this way because you can’t just put rabbits together and expect them to be friends. Especially if one of them is not spayed/neutered. You need to separate your rabbits immediately, before they end up injuring or killing each other. Females are particularly territorial and rabbits can fight to the death… They cannot be “friends” until both are spayed/neutered. You have your rabbits in a very dangerous situation. Why are you not separating them if they are clearly fighting??? They should not have any physical contact with each other and should be housed in separate cages. You continuing to let them fight could lead to them holding grudges and never becoming friends.

As advised in the other thread you made – Millie needs spaying, and you cannot bond til after she has been spayed and her hormones have disipated. You cannot put unbonded rabbits together.