I would be worried to if they were asking for pics of the house. I can't think of any legit reason someone would ask such a thing tbh. You are lucky that no coordinates etc are available to them because i'd be shitting it.
Just to be clear here, your kid got the pic up on google maps the screenshot it on their phone? You should be fine but yeah you should be on edge about that.
What area did she say, like "Hazel Grove" or more or less specific like "near the shops in x town"? The village i live in is pretty on top of travellers sneaking around. Not often but every now and then they are seen crawling along scouting houses or cars or something.