I'm sorry that your feeligs were hurt. I don't know the situation between you and your mom but give her a card a hug and or flowers and tell her you love her. Maybe she just doesn't want you to go through any fuss over her. Or maybe she just wanted a quiet day.
When my son asked me what I wanted when he was little, I'd tell him to draw me a picture. When he was a teen and asked, I'd say how about some pancakes. Now that he is an adult, I'd be happy with a phone call or a visit, he always did more anyway though. I never wanted him to spend his money on me, I wanted him to save it or use it for himself.
My mom was the same way with us and I wasn't sure what to do for her either coming up but now I understand why she said what she said.
Be encouraged and I hope you and your Mom have a Happy & Blessed Mother's Day.