OP (watch your name changes 
)
My very nice PILs consider me very 'independent' not a compliment they are always offering me 'help' that I just don't need.
My DH will be away for the next 2 weeks, there will undoubtedly be several texts and at least one phone call offering me help with the children ( to put this in context, I'm a very capable mother and the children are very well behaved. I work full time and love spending time with them. I don't want a rest from them.)
It is kind to offer but it is exceedingly rude and deeply irritating to be subject to continual offers when you have already expressed thanks and politely declined.
From my perspective it feels manipulative, like they are criticising my polite refusal of help and not listening to/or considering my actual rather than assumed needs.
My MIL is baffled by my life. She regularly states that she 'doesn't know how I do it' and therefore they assume that I decline out of misplaced pride or because I'd prefer to ask my own DPs. They are wrong - I just don't need any help.
If I sprain my ankle this week, I won't mention it to them because they'd spend all week trying to work out how to impose 'help' on me. Unless I literally couldn't walk at all - I wouldn't need it and the generosity of their offer would be lost in the irritation of having to repeatedly assert my wishes.
It is good that you offered. She said no. Leave it there.