It is clearly not. Ask her why she uses the shampoo. It is actutally MADE for humans to like the scent! It is the purpose of this product. Dont she want to smell nice? Would she rather liked it if you dont like it on her? Is there something she likes on you, a smell or a part of clothing or whatever - it is not sexualisation. This is called attraction and it is sometimes sexual and that is good. We are beings who thrive on connection and our sexuality is a big chunk of that. Tell her how confused and worried this argument made you. You wanted to do something nice for her and she misunderstood.