I think she's too extreme.
She's certainly preferable to Fillon in my opinion. I'm more liberal on economic issues so her anti-austerity economic policies appeal to me. She generally wants to protect welfare, raise wages, pensions, cut utility prices, control consumer lending rates, etc. whereas Fillon just wants to pursue austerity measures and stay in the EU.
Basically she's the type of conservative I like and he's the kind of conservative I don't like. I identify more as a nationalist and protectionist than a conservative though.