ok a couple things to think about
1 is the bike for her ?
2 you say longer rides , how long ?
3 is this for solo riding or two up ? see question 1
4 what can you afford , not want , a newer bike ? what is in your budget ?

my answers
1 I had a v-star 650 for my ol when we got married
2 50 miles -500 mile trips
3 have 1 bike for two up short rides have 1 bike for solos rides for me , would like a touring style soon
4 would like to find a nice street glide just cant afford it right now so will have to make due with what we have