Go see the slimes outside in the pen.
Go talk to Min in her shop.
Go see the slimes again.
Go talk to Min again until Megail offers her a job.
She should then be waiting for you outside Orilise's tree.
You don't need to buy any of her slimes.
Later you will have an opportunity to finance her caravan.
She also sets you up for an investment in Eustrin before the 3rd Arclent War.