An important thing to remember is that Do-er and Be-er indicate the MC’s preferential approach. Do-ers can ‘be’ and Be-ers can ‘do’ – just not as their go-to, first response tactic.
Examples from the software:
"A martial artist might choose to avoid conflict first as a Be-er character, yet be quite capable of beating the tar out of an opponent if avoiding conflict proved impossible.
Similarly, a school teacher might stress exercises and homework as a Do-er character, yet open her heart to a student who needs moral support.
When creating your Main Character, you may want someone who acts first and asks questions later, or you may prefer someone who avoids conflict if possible, then lays waste the opponent if they won’t compromise.
A Do-er deals in competition, a Be-er in collaboration."
With this in mind, Maria is a Be-er – it’s just that she’s been thrust into an overall story at odds with her approach, and so eventually she has to start Do-ing to solve problems.