How old is she? Also as far as strangles goes is it really prevelent is your area? How much traveling has she done/will do with you? Is she going to a boarding barn or your own private barn? How often do the horses she comes in contact with now or will come in contact with travel?
I have never heard of any adverse affects from re vaccinating but my suggestions would be rhino for sure as it really should be done every quarter anways so its about time now from the sounds of it. If you are very concerned about any adverse affects contact a vet in your area.
Yup Strangles is definitely on the list of must haves in my area - the barn my current horse is at has had a few cases already and they have issued an 'outbreak' in my area. And as I will be boarding her almost all barn demand that strangles be vaccinated against before they will take you.
The filly is also just turned two - so she is at a higher risk than a horse that is over 5.
Tetnus and Rabies are considered the "regular" vaccines around here, and to be honest I've never heard of anyone who isn't seriously competing getting the rhino vaccine in my area.
I've asked a friend to ask her vet when he's out doing the shots for her horse tomorrow, but I'm just wondering if anyone else has seen anything that might be negative. (her vet's been known to say anything to make an extra $) I'm asking my vet when she comes out anyway to give me Durmagel for my oh-so-clutzy gelding. But I like outside oppinions too.
Definatly check with your vet about what is prevelent in your area but I wouldn't reccomend skipping the rhino. Its not fun to play with and as you said young horses are more suseptable to issues. Even if you aren't showing if others in your barn are they put your horse at risk for contracting diseases