There seems to be a phenomenon that exists for me that if I am out with the intention to buy (either because I've been given a shopping trip as a gift or I'm looking for a specific item), it's really hard to find something that works. If I am out shopping for Hubalicious or kids, I see loads of lovely items ;). YLF has actually helped me quite a bit in this scenario, because I used to buy a bunch of cheap items that fit ok, just to buy something. Now I wait for what I love, frustrating as it can be.
I know you didn't ask, but I think it would be lovely to buy your mom something that you think is beautiful for her as a sweetly thoughtful gift. Then, it's either a well-loved item with sentimental value, or an opportunity for her to return it and keep her eyes open for something that speaks to her if you save the receipt.