Go online to luckyscent.com or aedes.com for niche scent samples or scentmonkey.com for mainstream scent samples, which run about $3 each. (You can find better prices amongst Basenotes members who decant from their own stocks, but new rules effective this weekend are going to make the posting process more complicated.)
I promise you, Mom will be infinitely delighted with a "bouquet" of samples presented in a lovely box or basket. When you buy only one frag, you've got only one shot at happiness. When you order 10, 15 or 20 samples, you're bound to strike success and guaranteed to give Mom something fun to try with every outing. She will be the talk of the town with her friends. And she can share the samples with them, if she likes.
As a 51-year-old German/English American with a taste for mild scents, I recommend L'Artisan's La Chasse aux Papillons and Nanadebary Green.
You know, we get asked this sort of question all the time, but nobody bothers to come back and report what happens. Can I give you that assignment, dear adjunct professor?