She doesn't care for money. She had had a legate's pay for twenty years and she had never been a big spender, so most of that money accumulated--hence her savings now. Toral gets his pay and it's more than enough for both of them (plus the cat
). If not Delva, it's very possible that she would refuse to take any money for her work, or she'd use it to finance the mission--to pay for artefacts or something like that. She doesn't need more money and she doesn't want
So even if Delva gets more than he deserves--she hopes that it'll keep him in the team, instead of leaving in search for more profitable opportunity.