How can I convince my stubborn friend to accept that she’s 5’10?

She said she was only measured to 5’9” last year and now she’s measured to 5’9.49. She says she’s 5’9” but I told her she should just round up to 5’10 because there’s no point and people will know she’s tall. I mean any woman over 5’8 is very tall. She should embrace her beautiful tall height. A lot of people wish to be tall. I’m 5’5 and I would LOVE to be as tall as her. She said, “You’d be as tall as men or taller than guys. They like shorter women.”
I shot back and said, “I don’t give a damn what guys want or like! I don’t care! I still want to be tall! I would love to be eye to eye level to men and tall people get more respect. So many women are jealous of you and your curvy. Stop being stubborn and just admit that you’re 5’10”!

She gets annoyed and she said she’s sticking with 5’9” ugh! Why is she so stubborn? She should embrace being very tall.
I wish I could be tall enough for my boyfriend who is 6’6.

Updates
9 mo
I mean would you round up 5’9.49 to 5’10?
How can I convince my stubborn friend to accept that she’s 5’10?
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