
Good on you Sylvia for giving this girl a home :)
The humping is probably part of her trying to assert her dominance etc. Im sure they will sort it our between themselves. I have 2 staffys and have just taken on a rescue staffy cross girly. All has been well so far but like I say they do like to play what *appears* to be rough but is more vocal than anything with lots of baring of teeth (which as i mentioned before can look a bit scarey to the inexperienced owner but is actually just *play* )
so long as you keep an eye on things and stop play when any of them get too excited or too rough then Im sure all will be fine
Its still early days yet- feel free to PM me if you need to :)