Ellie knows plenty but probably won't share anything she hasn't been doing already. She'll be very intent on insisting that she's absolutely not a titan or anything, and it's not like it'd matter anyway since good titans don't eat people.

Even though she remembers eating Eren. GOOD TIMES.

More usefully, she'll be trying to find a way to resume giving 3DMG lessons now that the dead district is effectively off-limits. Anybody know any forests nearby? PERHAPS FILLED WITH BIG-ASS TREES???