WHOA Horsey!! Don't do any of the below suggested things!
You want to shut her down, give her performance anxiety, and a "goal under pressure"?? No. People are not boxes (..well...). You cannot just "open them up" because it would increase YOUR pleasure.
This is going to take some time. And loving attention. And building trust. You can't hurry love--or her first orgasm. Please don't set her up for failure and ruin this cool thing you two have going.
Don't TELL her, SHOW her--very subtly and gently. Give her time (weeks...) to adjust to YOUR body first, then slowly help her learn to explore her own erogenous areas. Then with time, focus on stimulating her clitoris MANUALLY. Back off some on the oral sex right now if she's uncomfortable--she'll never self-suck!! Just because you think it's great doesn't make it so

)
AFTER she gets comfortable with YOUR hand stimulating her clitoris, then try to gently take her hand down there WITH yours to introduce it. A few nonconsecutive times ..
It will probably work. But it's an art, not a science