Wow, you're such a nice mom

I would be happy if my parents actually remembered when Ramadan is and it would be beyond happiness if they wished me a happy eid.
In addition to increased mindfulness and worship God during Ramadan, a big part of the month is the nightly breaking of the fast - the iftar. It's usually a big family get together or community event. Maybe you could mention in passing to your daughter that you have heard about the iftar and that you would like to join her and her husband sometime, and that you could even bring some food :happy: Then you could enjoy the time together as a family and then leave before the evening prayers.
Now, I'm just speculating here as to the reason your daughter may not be open about seeing you guys during Ramadan. I know that even after all these years, I am still shy about practicing my faith in front of my parents. Their faith is very private, so when it's time to pray or if we're fasting, I always feel ackward in front of them. These last few years, my birthday has been during Ramadan, and my parents have always wanted to come up and celebrate, but I've put them off, mainly because I don't want to feel ackward about fasting while they're here.
For some good reading, check out the Ramadan articles under
the R section of the index of Saudi Aramco world. Here are some
other articles as well.
Keep doing what you're doing. It's wonderful that you're willing to accept your daughter. She's very lucky to have you.