Hmm, you've gotten comfortable. You're not at the point where your pursuing her anymore. You've caught her and won the race! You still should be studying her like you did when you were dating. Do things for her, stuff she wouldn't expect. You need to remember what it was like when you spent all of your time trying to get into her pants. Do that again. If she likes you to buy her things do it. If she likes for you do do things for her do it.
Mine had told me before that she didn't really like gifts that much, so I had never really got her anything other than something small for Christmas or her birthday (which are very close together). This year, I decided to have something delivered to her office for Valentine's Day, a day that I was under the impression that she didn't like.
Best gift ever because it was totally unexpected. I didn't have them put my name on the card, so they tried to figure out at first if someone was stalking her.