Firstly, if u need any more help in regards to disability and PU, PM me, i do actually have a disability myself and it doesnt affect me.
On to this specific problem, as with most things its a case of if it bothers you it will bother her. Now i would be naive to tell you that you have to accept it and just get over it, because obviously that isnt something to easy to do.
All you can do is try and accept that it isnt going to change and you can either get on with it or stop enjoying life.
I know that sounds harsh but let me go on, many people on this forum have complaints like "i am to tall" or "i am a little over weight". Now, with all respect to them those problems they are either in their head (being tall is good 9/10 times) or they can easily be solved (assuming its not a medical reason for being oer weight). Unfortunatly, a disability cant be changed; ever. That really only leaves you with two options, make it work or stop living the way you want to.
I am also not going to tell you that it wont affect how women see you. Looks DO matter at the start. But only at the start. The main things you will put across before you open your mouth will be:
Sympothy
Needyness
There is however an advantage from this, you would have to meet 1 hell of a megga bitch to get blown out rudly. Now before i get flamed for telling you this, your delt a hand of cards and its not what they are its how you use them.
No women (especially in a social enviroment) will blow you out of set rudely or anything, could u imagine how she would look to people who dont know you? "omg, that poor disabled guy was just saying hello, can u beleve she told him to fuck off?". That just wont happen.
Now, as for this girl you just have to tell her. You cant not tell her unless you stop associating with her. Now, how you tell her is VERY important. This is something you can actually DHV. I mean really well. Getting through something like a disability and keeping your life fun/exciting etc is something that many people cant do. Its life changing.
Key things to cover while telling her about it:
You thought u used to have problems, then something happened
You thought it was all terrible then realised
Now you can get through things really well
etc etc i think u get the idea.
Hope that helps, feel free to PM me if you want to know more
Madals