You do need to submit the form 8833 but TurboTax does not support that form. You will have to complete it online and mail your return in with a copy of it. Here is a link to the form including instructions:
https://www.irs.gov/forms-pubs/about-form-8833
You don't need to submit any forms to her employer.
Use these menu tabs to report the $5,000 exemption from tax on your tax return:
So, you will enter the income and then cancel it out with a negative entry.
The instructions to Maryland taxes does not address the issue of the treaty you cite, so you need to call them to find out if it is exempt at 1-800-638-2937.
Thank you for your feedback. I was looking over the instructions for form 8833 and they referenced Regulations section 301.6114-1(c) (https://www.law.cornell.edu/cfr/text/26/301.6114-1). And under (c) Reporting requirement waived.
(c)(1)(iv) That a treaty reduces or modifies the taxation of income derived from dependent personal services, pensions, annuities, social security and other public pensions, or income derived by artistes, athletes, students, trainees or teachers;
So am I correct in assuming that since my wife is still a student, she does NOT need to submit form 8833? We should just be able to put in the treaty name/article used on the 1040 and list it is -$5000?