It's great you were not hurt badly! I know such storied when people sell horse as "bombproof" and then accidents happen. It's especially dangerous since the new owner doesn't even expect that! Anyway, good luck working with her. I'm sure she'll be fine quick! :)
Before you know it Lexi will be bombproof!! The morgans I saw were so calm and hardly ever freaked out after they got used to the person working with them.... One 3 y/o we pulled kids behind in a tobagan no problem and she'd never had to pull anything before..... the other worked in the dark and stayed calm even w/ flashlights and the driving lines got tangled up in his feet and would smack him unexpectedly on the butt...... everyone was so proud of them!!
When I got my Morgan he hadn't been ridden since august, and I bought him in November. I climbed on his back bareback the day I got him, and he was a doll! We even trotted :] As our work continued he was saddle broke and now he is great. He is calm and reliable. Morgans just need to be worked with on a schedule, of every day or every other day or something and they are great horses. Most Morgans need quite a bit of time spent with them regularly for them to be calm as a cucumber, my horse hardly spooks now and he was jumpier than heck! They aren't the breed of horse who you can ride one day and come back a week later and expect the same ride, they need exercise maintenance since they are a more warm to hotblooded breed. Most are between 5-7 on the temperament scale if worked with irregularly. If you work with them daily they can be as calm as a true 1!