Dependent travel during L1 to H1 COS

[erpraveen_ec]

Hello all members of this group,
My scenario:
I am on L1(Expired) I94 valid till March 2014
Dependent L2 Valid till March 2014
we both are in USA,
My employer is going to apply L1 to H1 COS for me in April 2013.
My spouse has to travel to India in May 2013 urgently and want to come back to USA by end of June 2013.
I am not applying COS L2 to H4 for my spouse now.
Question 1: Can she travel back to USA on L2 when my L1 to H1 conversion petition is in process?

Question 2: Will approved H1 I94 (through COS) always be effective from 1st Oct and i can maintain L1 status until 1st oct?

Question 3: in any case will my status change from L1 to H1 before Oct 1?

Thanks in Advance......please reply its urgent......!!!!