PS don't feel too bad...my MIL scratched our slab granite kitchen top (how she managed to do that, I really do not know!), burn a wooden spoon, melt several plastic spoons (in the food presumably, but I only found out afterwards), put huge scratches in 2 brand new high quality frying pans which were investments and supposed to last 10 years. Plus cooked with copious amounts of butter, salt and cream despite my husband having heart problems and trying to follow a healthy diet (we didn't even have salt in the house; she went through a jumbo pack in 2 months), cooking at high temperature with olive oil, making food incompatible with breastfeeding, etc.
Plus she insisted on walking around the house while holding the baby, despite having a bad hip and experiencing a few falls in the past couple of years. I'm fine with cuddles and holding the baby, but every time she stood up with the baby, I had to jump and separate them. So I felt on edge the whole time. Got me into hot water with my other half, but maternal instinct was strong!
Having said all that, she meant well, and doesn't know about healthy eating, feels invincible despite her falls etc. It was hard to take, but one day I'll be the old woman trying to help out and doing things wrong. At least she was trying. Her shitty remarks towards the end of her stay were another thing...but she is no longer living with us, and Skype sessions are ok because THEY END. :)
Rant over...