Subject or Object Pronoun

[McKinney]

Hi there, I thought I knew the difference between subject and object pronouns until this sentence:

I think just her and me are going out tomorrow.
OR
I think just she and I are going out tomorrow.

I know that the first I is the subject, but is the other two pronouns subject too or object?

Thank you!

[Alan]

'I' and 'she' are joint subjects, and the second version is grammatically correct!