should I insist with this friendship

last year at a mommy and me group I met a mom and we became friends. Both of our kids are the same age. I'm a SAHM and she works full time. The first few months everything was great. We met for playdates and walks. We spent some holidays together. I'm very caring always with my friends and I always showed her my appreciation. She wasn't like that, but I guess it was her culture (very different than mine). The past month is just me asking her when can we meet or what are her plans. Suddenly she is always busy or seeing other friends. She answers my text very rudely or never answers. I keep leaving stuff at her house even when she is not there (cakes, cookies, etc). I feel like an idiot right now. My husband tells me to let her go. Idk what to do.