Division Commissioner and Trainer here (and I've ummed and ahh'd about posting this for the last half hour)
To correct some things on this thread:
if the Brownies we in the immediate area of the meeting places, with no change in drop off/pick ups etc, no additional consent is required. It will be covered in the EI form you signed when she joined.
A risk assessment would absolutely have been done, and I agree littler pickers would have been advisable.
Brownie leaders are not "staff", they are volunteers.
Being disabled does not bar you from volunteering- I have dealt with many disabled leaders - with mobility problems, chronic illnesses, MH issues, a deaf leader among others. With the right support there is not much that can stop someone volunteering if they genuinely want to. Neither does having younger children or a job (most of us have those!). It is fine to say "I don't want to volunteer at the moment", but the handwringing "I'd LOVE to volunteer but...." martyrdom really pisses me off. Just say you don't want to, it's not for everyone.
For those of you howling to withdraw their dd and complain to Girlguiding, you are one of the reasons we can't get enough volunteers to provide opportunities for your dds.
I am currently dealing with a nasty, malicious complaint from a parent, which has distressed a (blameless) leadership team so much, we are likely to lose all three of them, even though GG won't uphold the complaint as it's nonsense, and probably the whole unit of 28 girls will have to close
I always sigh when I see a Brownies thread on MN, as it is a moan 9/10 times, and usually full of wrong information, which then gets ignored when the many leaders on here try to put the OP right.
The anti Girlguiding feeling on MN is second only to the DM haters IMO, which is odd because the DM hate us too.
But before anyone starts howling at me, please note I did agree that littler pickers would have been advisable.