My friend has a green card that expired. Is it too late to renew the green card or apply for citizenship? what are her options?

Assuming it's not a conditional green card, it's not too late.

L1-B to L1-A conversion premium vs regular processing and EB-1 petition

It is a wise move to change, if possible, to an L-1A visa in order to file for an I-140 petition later on. Regarding your questions: 1. 3-4...

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Issues in retaining priority date after i140 approval

You can be with your current employer in H-1B status and also file the EB-2 with another employer concurrently. Would need to review in greater...

Should i mention this previous organisation in L1 documents, would that jeopardize my background verification i

As long as you can state that you worked with the qualifying foreign organization for at least one year during the last three years, you should be...

Do we fill out 1 for my son and 1 for me? Or do we fill out for both on 1 form?

How old was your son when you got married? He must have been under 18 years old in order for your spouse to sponsor him.

Can H4 stay in US if H4 extn filed on time by EmployerA, but H1 changes job after I94 of H4 is expired and H4 extn is pending.

No, but when you leave the USA you will need to get a visa.

Will I lose my F-2 status if my E-2 change of status is denied?

No you would not lose the F-2 status as long as she continues with her studies.

Work Visas options?

There are several work-related visas to explore such as E, L, Os.

Will my L1 be invalidated, or i can work on L1 until i join new employer, which may not happen immediately in Oct.

If it is approved then come October you can either work in H-1B or L-1 status. It will depend where you are actually employed.

Will my I-94 still be valid if I request an L-1 Extension and it is denied before the end date of my I-94?

The L-1 denial would need to be analyzed before opining on this.