Definitely tell her. If you are seeing psych nurse for medication it is huge. If you T is bothered by the fact that you see another professional that is her problem.

I had a Pcp and psych nurse that I lost. I had a very close relationship with Pcp and devastated that I could no longer work with her. T helped me work through the grief. With psych nurse it was hard because finding somebody who would work with my issues with taking meds regularly would be hard. Then I found out I could follow her but it would entail sacrifices. T was a huge help in figuring out what to do.