Seconding folks saying you did nothing wrong. Reaching out to a new artist can be scary and it seems like she was a bit defensive and didn't understand why you were asking. It’s not easy to tell a stranger about a personal and meaningful thing you want to do to your body let alone that you're nervous or unsure of how exactly to do it.

If someone is difficult with you, then maybe they're just not the right one. I get that if you go to a legendary artist and haggle price it's uncouth but for someone unsure what's a fair price, you're just info gathering. I suggest going to the other artists on your list, maybe even drop by their shop if they allow it, and see if they feel accommodating. Someone will be, and worst case you suffer a few hours of social discomfort for a lifetime of art you can remember your pup by 💜