WIBTAH if I told my neighbour I can't tend to her cats every day?

So I have a key for my neighbours house, I'd consider her a friend, we sit and have a drink together and chat etc often.
The problem is EVERY DAY she texts me along the lines of "can you feed my cats and let them out please honey thanks xx" Sometimes when she's at work between 9 and 4 and sometimes if she is just on an outing. But it's literally every day. She has booked a weekend away in June and just assumed I'd look after her cats for 4 days without asking. I feel like messaging her back saying I am not responsible for her cats and that they won't starve if she's back in a couple of hours. Also if she's going to work to get up for work early enough to make sure the cats are outside/inside/wherever she wants them and are fed and watered. The reason I'd feel like an AH is because it's literally next door and isn't TOO much hassle, it's the principle and the way she just assumes ill do it,sometimes when I'm in the middle of something. Oftentimes I wait at the back door calling the cats and they don't come which is frustrating as I have to sit there for an extra 20 odd mins. Sorry if I ranted.