Weary about diagnosis

Hi,

I wanted some advice. My daughter I believe has autism and I am very weary about getting a diagnosis. She is now 13 and it’s becoming a problem  in regards to her friends.

She doesn’t see the bad in anyone and has some terrible friends. She doesn’t like communicating so I arrange everything. I am exhausted and I don’t particularly like any of her friends Some are mean, Some are manipulative , spread lies about her, Cause drama. She is quiet and doesn’t know how to stand up for herself. 

the trouble is I help her make friends and keep friends. But the quality she has Is poor. But I think is it better than being alone? 

she gets sad if she is on her own and I don’t think it’s good for her mental health. But I am exhausted as I go out with her as generally if I’m not there she will be picked on. 

I don’t know how to get help for this and if I did decide I wanted a diagnosis what help can anyone provide especially in regards to friends.

please help