communication is definatly the key, maybe she cant really handle the relationship she might want too but doesnt now how so havng her cousin there makes it easier for her.
she mght just need you to open the channel of communication so that she nows she can talk to you about it, this is all just me speculating from my own past experiances as a woman i now how sometimes its hard to talk to you guys just as vise versa.
hope all goes well!!