I used to do day care in my home, for 24 years. Any gift was appreciated, but alas, not many given. A gift certificate to someplace she shops would be wonderful.
For example, if she does crafts, then a gift cert. for Michaels, Joanns, or Hobby Lobby would be nice. If she shops at discount stores like Target or Walmart, then a cert. for those kind of shops would be nice.
Even a big box of candy, or some fresh flowers, just something to show that you appreciate the care she is giving. I applaud you on doing this. It will make her day, believe me Patty in MI