@EastonBoles ...
In addition to the information you received from @KathyPalm, you stated:
"...add a SPED teacher as a student into my course so she can see what her students are doing in class."
Just for clarification... if you add a teacher as a student, that teacher will not be able to see what her students are doing in class. In general, a student cannot see other student assignment submissions, grades, etc. of another student. Maybe this teacher is just wanting to see what the course looks like as a regular student? If so, there is a "Student View" that can be utilized without needing to enroll the teacher with a student role.
How do I view a course as a test student using Student View?
I hope this helps to clarify things for you.