OP, she's outraged at the moment at the unbelievable cheek of YOU not wanting to provide free childcare, BUT she may well calm down and come back to you for further help.
CF's don't give up easily.
Best thing you can do is give her the widest berth, barely salute only if you have to.
I had this from a woman living nearby a decade ago and it crept up on me that I was getting texts to collect her boy just as I was collecting my own from school.
Then she added an extra curricular.
fortunately only weeks to the end of the school year,.... so I sat it out.
Come September the first day back I got a request to "share runs again".
There was no sharing, just her asking, so I said No thanks I'm good.
She wanted to know what was wrong, I said nothing wrong, it just suits me to do my own thing, thanks.
She then came back with, oh can you just bring him home anyway.
I never replied and never answered another text from her.
Her nose was out of joint but I simply pretended not to notice when I saw her at the school, and she got over herself.
A year later she tried to approach me at a new shared coaching and I simply walked away.
That evening I got a text saying it would be great to share lifts, which I again ignored.
A couple of months later it got back to me that she had roped in another childs parents and wasn't doing her share and the mother was also intending to dump the arrangement for a parent that would actually share the runs.
These people never do this as a once off, it is who they are.
It's not about an emergency help out, as this was how I got caught the first few times, most people happily do that, this is about using people and taking advantage if they can.
I found just ignoring text requests to be very effective over the years.
So OP, she may well not be gone, she may well come back "only looking for a small favour".
Do not engage or entertain her as it will only encourage her.
As for the neighbour?
She may nod at her, but will most likely think she is a CF but not say a word!