Lieze's confusion was understandable, from having close to no options when it came to weapons as well as having a fighting style basically decided for her since she was born, she now had complete free reign on how to fight and what to fight with.
Thoughts about whether she should continue using a single-handed long sword or try out a different type had even crossed her mind, don't forget that just like Iris and Nerissa, Lieze is a sword obsessed girl and she obtained the "sword maniac" profession as well.
Therefore, you should expect her to go to lengths such as questioning whether she should continue using the same type of sword she has used through her whole life, since that was technically decided for her instead of by her.
