My friend asked me to buy a printer for her, as she is shielding and I'm not. So I did, it was £35. At the time (a month ago) she said she would transfer the money, she asked for my bank details. Since then she's mentioned she will pay a few times (unprompted by me) but hasn't done so.
Aibu to ask for the money? Or petty? Just to add, I have bought plenty of 'smaller' items for her since the pandemic started and never asked for the money. But I did ask for the money for this as £35 is a chunk. She's also asked me to buy more items now for similar amounts.
She is short on cash but spends a lot on clothes orders etc, so it is well within her budget to pay for this.