How to exchange email with potential professors
Don't be intimidated that she is a professor. It is certainly appropriate to continue your "conversation". Let her know of your interest in joining her team (possibly subject to funding) and give any constraints you might have. You don't need to say a lot, but thank her for her interest and express yours. 

Ask her for any advice about what you can do at the current time if it seems like there is a possibility to work together. 

In other words, write as if you are a colleague, not a subordinate.