If your daughter is trying to work from home with small children she is probably stressed up to her eyeballs and a family guest coming to stay may have added to that. She may also be on a reduced income if she is furloughed or worried about impending redundancy situation, especially if she has a large mortgage as many young families do. Help may be needed financially, if you can comfortably afford it, such as paying for the weekly shop and some treats, while you are staying or offering to pay for something that is worrying her. Otherwise household chores such tackling a pile of ironing is another form of help. Your daughter may be as insecure as OP in asking. I know I would never ask for help from my parents when I desperately needed because of the risk of it being refused, and feeling bad for asking for help. Your daughter has opened up to you and I think you need to ask her what help she thinks you can reasonably give her, and see what, if anything, you are able to do.