How do you turn her on?

It feels pretty awkward. We are only able to sleep together once a week and I ofcourse would like to use some of that time for having sex. Last night I just couldn't get her into the mood. I tried kissing her to where she likes and gently touching her and doing all the erotic stuff but no, she only kissed back a few times and that's it, or pulled her legs away if I was trying to go down. And I tried these mroe than once.

I know it's normal that you don't do it everytime but how do you handle situations like this? We aren't shy or anything and are comfortable with each other and all that..