answer:Send her a linked in request, but no message. If she accepts, then you can write her a thank you, wondering how you are type way, but DON’T ask her out. If she writes back, you can ask her to lunch or coffee; that’s when you can talk to her about not following through last time. You can’t assume that you can just insert yourself back in her life. She may be married, she might be engaged, she might have a child, she could have been married and divorced. A lot can happen in five years.