@Gymnastxo96
I'm in the US but not in New York state. I'm on the west coast but have had some dealings with guardianships and conservatorships. Most states have similar laws.
Medical guardianship is not an easy thing for someone to get and it's not given out lightly or without a lot of evidence. It's considered a 'last resort'. Your case would have been investigated by a 'Court Evaluator'. That's a person, usually a lawyer, who has knowledge about such things as autism and other conditions that may affect someone's decision making. And that investigation is more than just looking at the tests. They would have reviewed your records, spoken to you, and spoken to others who know you.
It sounds as if your mom is very concerned about you and worried that you may make a decision that could have a huge impact on your life.
Are you receiving any mental health services or assistance through a Regional Center? Or from an organization for people with disabilities? There should be some in your county. If so, they may be able to explain to you why the guardianship may be needed at this time or give you options to contest it.
You do have the right to contest it, but you will have to prove that you can make good decisions and are able to live and function on your own (pay bills, keep a job, keep a home clean, eat a good diet). You may know these things as 'Activities of Daily Living'.
I wish you luck, my dear, but remember that your mom seems to be trying to look out for your welfare.