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You can get married here and change her status. You can get married in India and have her get her H4 visa and come over.

I suspect they mean people living in the USA.

Usually, the duration of stay is 6 months and you can apply for one extension. Stays of more than one year on the B2 Visa are not allowed. If one applies and stays over after a visa extension denial, the existing visa is rendered invalid. Obviously, she can leave before the decision with no effect. Health Care can be a very expensive proposition in the USA as I am sure you are aware.

If you lie to them, you will be in serious trouble. Just carry your pay slips. On an approved H1 petition, you work for the sponsor.

It will not. You need to update your address with USCIS. How to Change Your Address | USCIS

If your latest H1 approval has an I94 attached, then you are in status till August.

The current Green Card is gone. You would need to file a GC for your spouse based on your Marriage. Then your spouse needs to file for your daughter's Green Card. You should let a lawyer guide you in the matter and file all the papers. You have to overcome the fact that they have not lived with you for the last 10 years. Maybe consult the firm of Murthy in the matter.

She will automatically be in H4 status till the expiry of the H1 petition when she enters the country. She needs a current valid H4 visa. If she has no visa, she will need to apply for the H4 visa back home after your H1 petition is approved.

why not tell them only if asked that you work for the H1 sponsor?

What is your current status?

Yes. To get 6 years in total you would have to leave for one year and then get a H1 petition approved.

An approved H1 petition after going through the lottery is only valid for future use if you have either worked for the H1 petitioner or have got an H1 Visa stamp based on that petition. If you get your H1approval without COS, you could continue in H4 EAD after the H1 petition starts.

It is always possible to reclaim the PD of a previous I-140 for a subsequent filing.

You need a valid H1 petition approval premium processing or otherwise. The procedure is for her to come back on the H4 Visa and show your H1 approval to be allowed in H4 status.

You have to be out of the country for one full year.