DalM0m is right. Lovers kiss with mouths open and friends kiss with mouths closed. I couldn't think of anything more gross than a friend giving me an open mouthed kiss. Uugh.
1.5hr delay in response is nothing. I sent my hubby a message at 5pm yesterday and it didn't arrive in his phone till the middle of the night (and scared the crap outta me). But even if the message is not delayed, it's OK for her to take time in responding. It's good to remember that other people's lives don't revolve around us.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.