Friend got married. We gave a card and present (a gift voucher worth more than we could really afford - she had requested money instead of presents). My Mum also have her money as a gift.
I know people are busy but there was no thank you card, text, nada. It's been 6 months. I find it rude but also it's so annoying to constantly hear my mum ask if my friend definitely received her gift, as naturally she's expecting some kind of thanks?