She will need a new visa in her passport if traveling outside of the US.

Filed my H1 last year on April 01 2013 .It was approved on April 23 2014 with April 23 2014 as start date. In my LCA the salary

The pay-rate must at least match the prevailing wage on the LCA since you have been in H-1B status.

Can my visa application/petition be canceled if the consular office thinks my daughter didn't show up for her appointment?

There appears to be some mistake. the Immigrant Visa registration should not be cancelled if the petition was automatically converted to the F-2B...

Can I work from home while on H1-B? I do contracting and client is remote.

The LCA has to reflect the correct work location and prevailing wage.

Which Immigration path would be best for us?

The TN visa is probably not a good option. Consult with an attorney to balance all the competing considerations.

About the proposed rule that H4 visa holders can work. How can spouse of H1B holders who are on H1 themselves get EAD ?

You can file an application for change of status to H-4. the new rule will be effective in approximately 60 days.

US citizen spouse

This depends on what your US citizen spouse is doing abroad. Consult with an immigration attorney for more details.

H1B under 2015 CAP-Ok to travel

Travel should not be high on your list of priorities right now. Listen to your employer.

I-539 Employment Question

The answer is the same as it was an hour ago. The USCIS is not interested in your interpretation of the word "employment."

My US Citizen wife passed away before my I-130 & I-485 was approved. Do I need an I-864 substitute sponsor?

The I-864 should not be required if proceeding as a self-petitioner.