Is it ok to date someone who is a little slow(sped)?

im 16. im going out with this girl who is 17 shes not bad looking at all. she introduced herself to me at lunch and i didnt notice anything wierd about her at all. but i notice that she puts her head face down looking forward at random times as if she is thinking about something or going to be hit. and she is a little slow in my civics cl. she takes all the reg. cles and a few study skills cles. ive been told by different people that she is SPED and i believe them. but she talks to me so normaly and i dont notice it much at all.people say she has no friends but he ones she does have are pretty wierd. should i still be with her. im not really in love with her but i like her. what do you think of this relationship and what people say or might think.