That's OK. You could definitely do it in the evening if you wanted.
It's ok, tbh. It's an easy enough job but it can be repetitive and there are some days when I struggle with wanting to do it (like with any job really, I guess), but that's because I'm a sahm so have to fit it around doing things with Zoe and obviously, I'd rather be able to spend more time with her. It'd possibly be easier with a littlie because they still nap, so could do it then, for example. Good luck to your sister.