J.A.
When i was putting my kids on sippy's I took away all their straw cups and bottles and left them no alternative but the sippy. It was two days of hell but after that we had no more crying or even asking for the others. They happily used the sippy. I didn't put my kids on a big girl or boy cup until around three and even now i give my son a sippy sometimes. I have white carpet!! Drinking through a straw is not a big deal. I have adult friends who only drink through straws. Don't fret about it, it's not going to hurt her at all.