Bonding two females and some odd goings on!!!

I have put two female rabbits together. They are actually Mother and Daughter. They are doing well with each other but, Mum is mounting her daughter and thrusting (as if mating) with her :shock:. And she doesn't seem to care which end she does it, head or tail. I am hoping it's just a kind of dominance thing perhaps? Theres no fighting at all, just a lot of sniffing and the two or three moment of misguided love... :roll:

Is this normal? They are defo both girls (the one doing the thrusting is the mum!)...

Are they both speyed?

Mum is yes, would not having the daughter done cause this???