Do I think Alex fancies Evan in 2008? Nope. Definately not, no chance. He is, pretty much, her dad albeit not in the blood relative sense.
Now, ask me if I think she fancies him in 1981 and that's a different kettle of fish (as the saying goes).
I think Alex has completely mixed up feelings towards 1981 Evan.
I think she genuinly does find Evan attractive in 1981...hence her reaction when she first sees him and exclaims "You were gorgeous!!".
It's a bit like when you look back through an old family photo album and see pics of your parents deacades ago and you think "Crumbs! I forgot you were once young!". Get what I mean?
It doesn't mean you would fancy them but it shows that you forget that the adults you grew up around were once young people too.
But Alex...yes I think she found Evan very attractive and I DO believe that she genuinly (maybe reluctantly) fancied him.
Wether she would have actually acted on those feelings is another question entirely.
But for complete confirmation, just look at the scene between Luigi and Alex after the 'not quite a date' with Evan in 1.4.
After Alex has finished squirming about how "it really wouldn't be appropriate" Luigi asks Alex directly, "You like this man?"
Alex's response is to nod, mouth the word "Yes" and then grin.
So the answer, I believe, is a resounding YES to her fancying 1981 Evan, but not 2008 Evan.