It's her right to ask for financial help for her pet. It's also the public's right to make the decision about whether to donate or not.
But if she's asking for more, she's potentially diverting funds that could go to injured children, or for funeral expenses for a murdered loved one, or to a mother who's fighting to survive an illness.
I think that some strangers who just love pets might donate, but it sounds like your daughter's ethics aren't the finest, and probably people who know her might realize that and withhold donating.
Google Go Fund Me Rules and you will read that the "organizer", which would be your daughter, states that by creating a campaign, the money will be used as stated for the intended purpose (the dog's surgery). If someone were to discover that, say the surgery cost $10,000, and your daughter raised $12,000 and used the $2,000 to pay off her car or go to Vegas, well, that person could file a complaint or seek other methods of complaints. Many times people raise more money than expected, and they use the extra funds to help similar people (in other words, your daughter could donate any extra money after the surgery to the veterinary hospital to pay for another dog's care, or donate to the ASPCA or humane society - people probably wouldn't have a problem with that).
But to try to raise more money than the surgery costs is unethical, and could be a real problem according to GFM rules. She's an adult, and responsible for her own behavior. Sorry that she's greedy.