I can't tell if she likes you or not cuz there are really many types of girls, but still you can try. Even if at the end it wouldn't be like you want it to be, you'll know that you tried
@TheFreeSpirit: if she's in a relationship with another guy then talk as friends but no you shouldn't tell her your feelings when she's not yours to have..that would be disrespectful towards her current partner and put her in an awkward position..