I'd find it difficult. Although maybe it'd be easier than, for example, trying to write an email to someone who I've not replied to for months because I couldn't think of anything to say-that involves a.) thinking of something to say, and b.) thinking of a justification for why I haven't written back for 6 months!
You said you'd find it easier if you could talk about common interests, so I suggest that a good place to start would be asking her what her interests are. Ask her what her favourite subjects at school are, favourite books, whether she has any pets, or hobbies, or favourite animals. Tell her some of your interests too.