NTA. Maybe for the next holiday or birthday you could ask her for ideas? What I get my boyfriend is different in price every time, but I don’t judge our gifts to each other in prices. In our relationship we’ve both bought food/groceries/stuff/gas and there’s no way to calculate all of that. I can buy him a $45 belt buckle for Christmas and he can buy a $40 dinner on one night. If she likes certain expensive things or her taste changes, it would be nice to buy it. As long as the cheap/expensive gift has thought and isn’t something random, price shouldn’t matter. She could help you by giving hints or telling you what she wants.