Well... forcing her won't help either of you. Even if you do find a way to learn what it is that gave her that block in the first place, she still might not want to utilize those skills. Especially if she seems resistant to even breaking objects...

[She looks back to the pokemon in question.] She did trust you enough to allow her to bond with you in the first place, whatever those issues are. Respecting that is part of that bond, don't you think?