Let your employer know about this arrangement and hopefully they will agree to it. They will also need to make the necessary DOL attestations...

I was told that I can change from L1b visa to H1b only when I go get a stamp outside USA. That statement is not accurate or has any legal bases.

Change of citizenship, how to restore my work visa? Change is citizenship will not affect GC process. You may seek H-1B cap exemption.

NIW EB-2 is for permanent job and in some cases, depending on the candidate's birth place the visa number may not be readily available. This...

If B-2 is denied, you will not be able to seek F-1 after. Any COS application requires you to be in status.

Yes, she can apply for B-2. There may be questions regarding her immigrant intent and if she seeks proper counseling she will be able to overcome it.

It is not recommended to file COS as you are not maintaining status. However if the reason for falling out of status was beyond your control and...

If for some reason the joint sponsor used is rejected on the basis that the joint sponsor does not meet a certain criteria, then can another joint...

You will have to mention the arrest or citation on immigration forms. Depending on the nature of crime, as CIMT, it can have severe consequences...

Not sure the reason or difficult to move to L-1A, however since some requirements are similar for EB-1C, you will need to consult with an attorney...