Should i write back? was she just being nice?

I was going through some old messages on facebook and found one from a girl i dated briefly 2 years ago... we hung out for about three months and had about ten times. we had after breakup which caused a fight and we left things not good. anyways, i got a job similar to the work she does (we both work w/ the disabled). i figured why not write to her... i just told her abt my job, that i hoped she was well and had faith she'd be up to exciting things, and that i was half-crazy when we hung out. she wrote back a few hours later, saying she was well and hoped i was too. i was surprised pleasantly that she wrote back but am not sure from her message if i should respond? i'm not sure what i want? i just think she is pretty cool and i still think abt her? was it good she wrote back or was she prb just being nice?