Can I apply a fiance visa for my partner even though she had a revoke visa last 2 yrs ago?

Yes. You may petition your Fiancee.

I was sponsored by my sibling in 2001 and accepted in 2004. How long do I have to wait for my green card?

Sibling petitions can take a long time. And it depends on your country of birth. It could be anywhere from 14 years to 22 years.

OPT /Green card

You may file the I-765 and I-485 concurrently.

Will she be denied citizenship and lose her green card?

From the information you gave, it looks like she is eligible for citizenship.

I-485 was approved then reopened the next couple hours?

It seems like your card was approved. You should check the I-485 case status online and/or call USCIS.

Do I need inadmissibility waiver?

I would suggest to have a consultation with an attorney and give more information about your F-1 visa. If you entered with a visa, you could be...

Do I need a new visa?

Normally you would need a new application for a new employer, but I would need more information on your case to give you an exact answer.

Can I apply for a J1 au Pair visa for a second time, after extending it, if the 2 year rule does not apply?

Yes, it is possible to be an au pair more than once.

You should try tracking your package thorough the mail service you used to send the package.

How ? Can My sister visit me in the United states

Yes, your sister could apply for a tourist visa.