Does my leopard gecko have crypto ?

I have had her for 2 years now but for a while she has become really skinny and she isn't shedding. I have tried bathing her by putting her in warm water and rubbing the skin to try and make it come off but it isn't working the skin that was supposed to come off months ago is now gone a brown color and she isn't eating and has become so skinny you can see her bones. I think she is dying but i don't know what to do,i also read about something called Crypto, does my leo have it ?