What shapes can Mimic Form allows one to shift into? Human? Supernatural creatures? Animals? If my character manages to get a hold of a vampire's blood, a dragon's scales or a tiger's hair, will she be able to take their appearance?
Good question. The book doesn't make that clear.
If I was your GM I'd say you can transform into any living thing but that you don't get the Powers their shape implies. Which means your dragon disguise is going to be very small, flightless, and blunt-clawed. So not very convincing.
With Mimic Abilities, it's basically open season. At least if I'm GMing.
If she takes the form of an individual of another gender, will she gain their reproductive abilities?
Book doesn't say anything about it, but I'd let her impregnate someone if she was in male form. Not that it's likely to come up at the table.
And not to be That Guy, but it's not gender that's relevant here so much as sex.
How hard is it to see through a Glamour?
Glamour-maker's Discipline/Deceit roll, +2 if they have Greater Glamours.