What I'm wondering is, because it's only about 2-3 feet away from the back of her house, would it be dangerous to turn this into a backyard pond? I don't want to suggest anything that's going to end up endangering her foundation, but I think her children would enjoy having it back there.
I don't know a lot about backyard ponds, so I thought I would ask you guys, because I've been reading the posts here and y'all seem to know what you're doing.

What do you think?