AITB for prioritizing my own Goals first?

My(26M) GF(33F) and i got into an argument recently over what I should do with my own savings.

She knew since September that i would be saving up my money to fix my computer at the start of next year that meant no expensive dates or suprises for a while but we can have a great Christmas together.

Out of the blue she got upset with me because she found out how much money I've been saving a month and what else i plan to use it for next year saying that fixing my computer and indulging in hobbies is not important and that i should be buying a TV, new washing machine and a microwave instead

I told her again that she will have wait i even promised her I would take her out for her birthday once the expensive issues are out of my head but she still insists im using my money for useless things.

At this point idk if she is just serious or joking so im posting incase she is actually offended.