Yes, tell her how you feel, in a low pressure way. You will regret it if you don't, and if you wait too long, she'll find someone else. Tell her she can think about it. Tell her it's OK if she doesn't feel the same way, you won't be weird about it. What you wrote sounds great so it doesn't sound like you really need a lot of advice and I'm not necessarily the best person to give advice on this sort of thing, even though I'm female. Your last sentence -- "if you ever want to do something fun together" is in my opinion too vague. I would just go for it with: "Want to try going on a date?"

Only thing I'll add is don't ask her questions that are none of your business leading up to your confession. I've had guys ask me if I have a boyfriend first, before telling me they like me. It pisses me off a lot. It's like they think my personal life is their business because they're interested in me, or almost like they're implying I'll cheat if given the chance so better they manage that issue themselves. You know she's single so you won't stumble into that, but it's something to keep in mind in general.