I offered to buy her dinner tonight (not as a date, but I told her to go wherever she wanted to go and I would buy), of course she accepted.
She sent a text a few minutes ago thanking me for the Chili's take-out she got.
I think your heart is in the right place but I strongly urge you to proceed with caution before doing this again.
Your goal is to build a relationship with your wife. You need to ask yourself what kind of relationship you are building if she is eating take-out without you?
If she choose to eat take-out without you this may not be a choice you want to financially subsidize.