Filing for Amendment in Current L-1B

Assistance required in filing for Amendment in current L-1B valid visa till 11/02/2018. However as per I94 we have time till 2nd Jun to exit and then come back again to United States. In order not to go out of Country, we need to file for Extension which we could file for an "amendment" because of the discrepancy in her situation and request the validity of her L-1B till 11/02/2018. This is the current valid date right now for the L1B We need someone help us in filing for L1-B amendment for extension till the visa valid date. Thank you