A bit late, I know, but I'll still give you my take on it. That being, yes she already has scars and is proud of what they represent, but the ability of a barely-novice swordsman to put a new mark on her is a significant accomplishment in itself. She's not testing herself, she's testing Garrick, and contriving to make an opening for a telling blow on someone of her level of training and experience is as firm a result about him as any trial by combat can give.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows