Mike, my wife is 5' 4" and has no problem getting feet on floor. Could your seat be mounted differently, i.e., build error? Have you tried other Senecas to see if there is a difference?
2015 Jayco Seneca 36 FK
2016 Jeep Wrangler Unlimited tow
2010 Tiffin RED 36 QSA - gone
2011 Monaco Monarch class A - gone