Engaging in sexual intercourse with Mildred is perfectly fine as long as there is mutual consent. However, it is not required. Kind words are usually sufficient.
When I was in school the kids with the weird names were either picked on or they were super cool and popular. Their parents had no idea which one they were going to be when they chose the name.
Your friend has the benefit of knowing who she is already. If she knows she's going rock it, then go Mildred.
I've noticed a trend with trans women picking the stupidest names, and idk why. Like I kinda get Mildred because it's a classic name and has a cute nickname. So it stands to reason maybe she has a family member that was a huge influence on her so she wants to honor her with that name but why the fuck do people pick names like Lola.
I knew an old lady that has since died, her first name was Mildred. She went by her middle name because even when she was a kid, Mildred was perceived as an unattractive name.
It could be a David Foster Wallace reference. "In the eighth American-educational grade, Bruce Green fell dreadfully in love with a classmate who had the unlikely name of Mildred Bonk. The name was unlikely because if ever an eighth-grader looked like a Daphne Christianson or a Kimberly St.-Simone or something like that, it was Mildred Bonk."