The dinner alone should be okay. You can't overwhelm her if you've been apart for a length of time. One other thing to add, do not expect miracles and one date will not bring her back to you. I had a "date" with my W in October. It went very well but the very next day we had the worst day since our BD date. We haven't had another social meeting since even though there is an open lunch/dinner invitation. I asked her to go to lunch or dinner 6 weeks ago. I've only brought it up once since then but she says she has been so busy. She is busy, but never too busy to see her friends frequently. I don't mention how she has time for her friends (that would be beyond stupid to say) and I continue to move on.
M 55 W 52 MR 32 T 34+ D29 BD May 8, 2016 - She moved out ILYBNILWY May 15 (Through email) No EA/PA August 23 - DB used against me in every way Divorce July 18, 2017 - Life is getting better every day