Aw beautiful mare, and I love her mane! Must be fun to brush and braid!
For pulling, it's really up to you, it all depends on your preference. However, last year when my horse rubbed some of his mane, I just cut it all to a short length with small scissors, and looked just fine. :)
Pulling looks more natural tho, you'll need a pulling comb for it, and if you are unsure how to start/do it just talk to an experienced friend, trainer, etc.
"In the end, they're only going to remember you for the times you smiled when you had every reason to cry."