Tarene as Thor Girl before the depowering was pretty much Thor's Supergirl, very close to his power level. She'd beat Wonder Girl and it depends on which incarnation of Mary Marvel it is. Afterwards though? I don't really remember if she did anything of note but she probably gets beat up by Wonder Girl.
Lady Sif should lose to either but I can see one of those rare scenarios where she gives Wonder Girl trouble. Should substitute her for Valkyrie, although current Valkyrie might be too beastly.
Actually she looked pretty tough there. But her Tarene powers were very slowly starting to creep back, of course they came in bursts so it was obvious when she was above normal levels.
Which Mary Marvel? When she has Adams powers you need original Thor Girl like when she faced Thor and Gladiator. Regular Mary Marvel? I guess I can see Thor Girl fighting her evenly but I don't really remember her doing much.
Maybe. Sif does have some really good feats here and there like her fight against Enchantress and her brief scuffle with Masterson Thor that would easily put her on Cassie's level but those are outliers. I remember Cassie getting a push to near Wonder Woman levels near the end there.
Mary Marvel before the amp owned Captain Atom, IIRC. Cassie during Wonder Woman's absence was getting much respect, but I wouldn't put her near WW level overall.