没经验咱学经验, B让咱shine咱就shine. 务必报请头批准, 这样才能不白干.

Glad to know you are little bit famous now, so the big boss is recommand your name to other division.

Yes, even you think the stuff is not hard to do, but it may not be true for others.

Therefore, this is a good chance for you to shine. Yes, do it! But, before you do it, you need get your manager approve and be sure he/she is happy, so you will get good performance review later.

Email to B:
Thanks for the email. Yes, sure I will be happy to help.
As you know, Mr. Nice Boss is my manager, I have to get his/her approve first. Let me report to him and then I will more than happy afer his approve.

Email to your manager:

Boss,
I appreciate your gave my contact info to B, thanks!
I just get this email from B, I would like to know how do you think about her requirement, will you approve me to help them on this project?
Yes, I have things to do right now, however, it is OK for me to arrange time and help them if you do approve.

CC: B's email to boss.