Was I wrong to ask my neighbors' disabled daughter to leave our party?

AITA for kicking out intellectually disabled young woman from my party?

My husband and I live in a townhouse with a weird backyard set up. All the homes in our row have a mostly undefined backyard so that maintenance has access to mow the entire yard.

However, there are tall wooden barriers/fence between each unit to distinguish the parcel of lands to its units, it just doesn’t extend to the end of the backyard. Hope that made sense. All the neighbours have an unspoken agreement not to enter each others’ lots.

We have a new neighbour about 4 units down who has a daughter, J, in her 20s(?) who appears to have a disability of some kind. I don’t really want to assume, but her cognition seems younger than she is, she is a bit messy.

J has taken to sitting in our lot, most of the time it’s directly within the barriers so she’s a few feet away from our backyard door. She might be singing, lying down, playing on her phone, or picking the grass. I (nicely, I swear!) introduced myself to her and her parents, and asked the parents if they wouldn’t mind keeping daughter on their lot since the grass was getting big bald patches.