This is EXACTLY what my gelding did. Twice.
The first time I roached it and it looked good and kept him a little cooler in the summer. He has a similar neck to Lemonade, so maybe she will look good with it roached. He looked very tough and manly with a roached mane lol.
This time he rubbed out his mane in January when we got more round bales because of the snow. I was growing his mane out but now it has a 6-7" part that is spiky. I don't want to roach it again but he is looking pretty ridiculous because his mane is growing straight up and is probably 3" long in the shortest parts. This time I am going to wait until his mane lays on his neck and I will trim everything to length. It shouldn't be too much longer now since his mane grows fast.
Whatever you decide, remember it is hair and does grow back. Less than a year later and my gelding's mane where it isn't rubbed out is about as long as Lemonade's mane.