Follow her lead
I don't mean do everything she does--especially if she has a hard relationship with one or both.
But for example, if she wants to see one, and wants you to join her, then do. If she does not, then don't push her. You may form opinions about one or the other that differ from hers--she will need the space to work out her own solutions. If she asks for counsel, offer it gently. Above all: support her.