Roommate opened my tax mail!

Need some opinions on the matter.. I live with a roommate who gave me my mail today from the IRS and the envelope looks suspicious. Oddly a lot like her hand writing actually. It’s hand written, certain things not capitalized… just seems off. She said she got a letter like that too but threw it away. I think she opened my mail. She’s also the worry constantly kind of person so if she’s curious about something (especially “let me know if it’s bad or good news” type of situation) she would be bugging me constantly about it but hasn’t said a thing to me! Almost avoiding me! I could be overthinking it.. idk you guys tell me what you think