This is a tricky one. It's probably less about the breastmilk and more about the time with you. A quick breastfeed allows her to reconnect with you and for her to have some time with mummy. One of the disadvantages from working at home is that little ones think that if you are there you should be spending all your time focusing on them!

I have found with my boys that 5 minutes with them can buy me an hour or more of time to get things done. So one idea might be to allow her one or two breastfeeds during the time that you are working but no more. Talk to her about how she can only have how ever many you agree on, and then you need to do your cooking. Perhaps even give her a card for each feed at the start of the day. She can swap each card for a feed but when they are gone there is no more until your work is done.

Otherwise, if you don't want to feed at all, perhaps you could relate it to where you are. When mummy is in the kitchen then you drink from a cup (or bottle etc), and there is no breastfeeding. At other times when mummy isn't in the kitchen it's ok. Or as mentioned above, the apron - when it's on no feeds. Or anything else such as when it's daylight etc, depending on how much feed free time you want.

It sounds like you really need some support and a housework fairy to come and help you too. If you find a housework fairy please let me know, I need one too Hopefully your mum will be a big help and allow you to relax for a bit.