Dream agent asked for partial ... do I send out more queries, or just wait?

Hi all, I am new here ... what a cool resource this is. Thanks for all the great info.

I am just finishing my first (nonfiction) book. I sent out a few queries and was asked for a partial submission from my very first choice, this total super-agent in Manhattan! Shocking! Yay! Freakout! I worked really hard on the full proposal, using the exact instructions provided on Ms. Super-agent's website.

Should I wait for her to get back to me, or keep sending? If I keep sending, and I am lucky enough that another agent shows interest, would it be okay to write to the super-agent (or her assistant) and say that someone else is interested? What would the correct etiquette be?

Many thanks in advance-- Maria.

Thank you so much, not least for your patience with a noob. I sent out to five more this morning.