The only way someone else can have access to your Turbo Tax account and your return is if you provide them with your account information, including your log-in information. They would need to have this to proceed.

turbotax challenges her IP requests PIN

To get the IP PIN you can use the attached link and follow this for assistance: This was put into place for security/identity theft and fraud prevention purposes.
<a rel="nofollow" target="_blank" href="https://www.irs.gov/identity-theft-fraud-scams/get-an-identity-protection-pin">https://www.irs.gov/i...>.

You may use our Get an IP PIN online tool to retrieve your current IP PIN. We require you to register and verify your identity in order to use the tool. This process is essential to protect your personal and tax information. Please refer to “Step 2: What You Need”, before using the online tool. Follow the prompts to retrieve your IP PIN.

If you previously created an online account and obtained an IP PIN, access" Get an IP PIN" and log in to your account with your username and password. You may be required to verify your identity again due to our increased account security. Follow the prompts to retrieve your IP PIN

i should be able to designate whomever i desire to assist in MY return.

Absolutely, remember though this is put in place to keep Identity theft and fraud at a minimum. The extra steps are put into place for your personal security.

again ... it should be MY choice.  I pay!