A.M.
yes, keep her in the rear facing position as long as possible!!!
i LOVE LOVE LOVE my evenflo triumph(i think thats what its called). honestly, its the best and does fine rear facing in my toy matrix. the thing is, try to have the seat on whatever side the smaller person normally sits in, if you are large and push the seat way back, no matter what car you have, it wont fit.
the evenflo is great, it has knobs on the side that click to tighten and loosen so when you are changing seasons or coats, its super easy to adjust the straps. it also goes up to 50lbs which is great. the 5 point is safer than those backless boosters, so she could easily be in this until she is 5, before changing to a booster.