I would wait another couple of weeks before re-mailing the amended return. The IRS says you should be able to track in within 3 weeks but they don't always meet their targets. The return can take up to 16 weeks to process. If you mail it again, make sure you mail it registered mail with return receipt requested.
Here is an IRS Q&A about amended returns: <a rel="nofollow" target="_blank" href="
https://www.irs.gov/faqs/irs-procedures/amended-returns-form-1040x/amended-returns-form-1040x-3">htt...>
