Most countries have a 'Mother's Day'. In Britain it's in March each year yet in the USA it's in May - this year 10 May is the day.
I'm not going to linger over any complicated suggestions of what to do on Mother's Day this year, simply to say that if your mother likes ice cream, you could do worse than to give her a special ice cream surprise.
Make some homemade ice cream fresh that morning - such as vanilla ice cream - or take her out to an ice cream parlor for a special ice cream sundae. It doesn't have to be expensive and it doesn't have to be a great big serving of ice cream. Then again if she really likes ice cream sundaes then order her something like a Knickerbocker Glory! Just as long as i'ts something you know she likes.
After all, Mother's Day is about showing that you care and how better to do that than recognise that she deserves a little treat occasionally. That's the magic of ice cream!