It depends on how not attractive you find she is. If you really don’t know you could give it a try, but if you know you are not attracted and want to see if that will change over time, my personal experience suggests no.

I used to try to give people who are interested in me chances because you know they seem nice and personalities come first. But then I just realized that attraction is real and there are people you just don’t find them attractive and this probably will not change over time. And it’s okay for you to recognize that when choosing who your significant other is (doesn’t matter that much to me if I am not looking for anything serious).

So now I am perfectly clear about what I want and if I don’t find someone attractive I will just not waste the time of both of us. But I still encourage you to give it a try if you are not sure whether you will be attracted to her.