I was thinking the same. Also you say "not that I think I would mind" in reference to her being more than a friend. So you'd be best working out, truthfully for yourself, what you want this girl for. If it really is just as friends, then don't worry about it if she seems distant or doesn't reply - she'll soon find your number if she wants more time/support/help or whatever, then you can be that good friend.
If, on the other hand, you do actually want to be more than that, then you might like to not be so keen when it comes to friendly gestures. We've all been there I'm sure, playing the role of the attentive good male friend, but unfortunately as ten tons of internet memes will happily report (as if we need them) it rarely if ever leads to things being more than that. If you do want her to eventually be your girlfriend then try practicing some outcome independence. Stop thinking "I wouldn't mind" and start thinking "How can I make this happen?" Next time you really really want to message her, just don't. Before you know it you mind find the tables turn and it's her wondering why you don't reply.