**You're right in the fact that Mailali doesn't get an AoO, the Tiger has Improved Grab. And you were sooooooo close to beating it! **
The Tiger, finally getting full purchase on the Elf brings it's hind paw up, the smaller claws out as it rakes them down Mailali's chest.
Rake Attack: (1d20+9)[24]
Damage: (1d8+3)[8]
Crit Confirm (if required): (1d20+9)[12]
Crit Damage (if required): (2d8+6)[16]
The rear claws digging in, leaving bloody gashes down the Elf's chest and belly.