AITAH for being a bit upset that my mum changed her mind on giving back money she borrowed from me?

I lent my mum €330 for a bill back in September because she asked me for it. At the time she had lost her purse and the money for the bill was in it so I said I would lend it to her. Fast forward to today I just reminded her about it and told her no rush and I’m not really expecting it back until way after Christmas, but just a reminder so she doesn’t forget. I was told she changed her mind on giving it back because I live in the house and she’s paying for the food I eat and for painkillers while I’m sick. Am I being unfair or unreasonable for being a bit upset about it? Like it does make sense, but also I would have rather known because I’m saving up for an extension on the same house. I don’t know, let me know what you think. Am I being a bratty kid?