Tom DOES have some really good advice...
That being said, if it doesn't work, just exchange it for one that does. I worked at Tractor Supply and even with no reciept, we exchanged broken things all the time. Even if it looked liked user error, if its for some chinese widget that cost ten cents to make, we would do it because it made the customer happy and they'd be back for something else later on. I knew when things had been abused, but most people who worked there dont know tools thus didnt know.
Im sure Lowe's has the same policy.
Id have them exchange it for something identical, and just never tell her. lol.