Of course, remind her that being a kind person is much more important. And remind her that we all have things that make us feel insecure - height, weight, hair colour and the like. Personally, I like interesting noses and wish mine was not so boring.
Also a lot of the people who make these comments are just looking for a reaction so a poker face is essential. If they get a reaction, they'll never stop. So just ignoring them and trying to take the high road is not always enough; sometimes direct action is needed.
So on a practical note, ask her what insults she has heard in the past or anticipates and then try to work out some humorous responses and role play a little. A quick, light retort often diffuses many situations and knocks incipient bullying on the head but it can be hard to produce these spontaneously.
'all the better to smell the roses with, dearie' (little red ridinghood)
'I can sniff out chocolate at 50 paces'
sniff, sniff, sniff 'you smell like a bully'
all delivered in a calm, jokey tone of voice to imply that it's no big deal and to wind down tensions.
The best defense is a good offense and being prepared is worth its weight in gold. If she feels ready to cope that might ease her anxiety.