1295: Where In the World Is Mother Gargle?

I've never understood the logistics of Mother Gargle to the Thornapples. We only see Mother Gargle when she is at the Thornapple house but we know from this recent strip that she lives in Erie (I'm assuming the one in Pennsylvania) but sometimes she's portrayed as living right there in Cleveland with them.

Bottom line, it doesn't matter where she lives because she spends way too much time at the Thornapple's house and I am 99% sure that she doesn't live with them.