I applied for n400 in august 2020 in miami and still no biometrics schedualed ?

Be patient at 1-2 months is not a long time to wait for biometrics. Your application will be processed with possible delays.

Yes you may and it depends on whether applying through adjustment of status (if parents are physically in the US) or consular processing. Best to...

Travel while applying U Visa?

It is not advisable to travel with the pending U visa application.

Can you helph me??

No this alone is not a grounds for denial.

How long does it take to get a biometric appointment after receiving the notice of action ?

It can take 3-4 months for biometrics and possibly sooner given delays. You can contact USCIS directly to inquire.

Can I get an adjustment of status i485 approved if I have a tax balance ? For the record I am enrolled on a payment plan.?

Yes but you should have remedied the tax balance or worked out a payment plan with IRS.

Best to consult with an attorney to review the criminal matter and determine how to proceed.

No the sponsor does not have this ability.

Filing Green card i485 ?

You should disclose any other names used in the appropriate forms.

Yes she may be eligible to apply but must maintain status if applying under F2A category.