She's got a nice neck for it...
It's just hair and it will grow back, so I'd say go for it if you really want to, but my tips below may help:
But if you like the length, use Mane 'n Tail shampoo and conditioner - it works MIRACLES!
But if her mane is coarse, baby oil works miracles!
My Walking Horse Dusty has very thick, coarse hair that baby oil makes shine just out of this world and also gets rid of frizz and makes it easy to comb.
However, my Fox Trotter Roany has normal thickness to his mane, but his hair is very fine, and his forelock frizzes up a lot! I use Mane 'n Tail on him and it makes his hair feel soooo soft like human hair! You could try putting the forelock in a braid (not hunter/jumper like, but a normal, long braid). I have seen many a Western Pleasure horse sport that look and it usually brings out the shine in the forelock.
Hope this helps!