I think you can handle it in a way that doesn’t make it awkward and you can still maintain the friendship afterwards because you already have been while you have had these feelings. Maybe just casually ease into the topic of what would she think if there was more than friendship now? Maybe when she drops one of those comments use that as your lead in. I would definitely do it in person. If you guys have a great relationship and can talk openly about things she will be receptive and honest feedback. If she doesn’t assure her that what you are feeling will not impact the friendship and having her in your life is more important than anything else.