"... I'll do what I can in the trials." It's not quite a promise, but now that Pearl has brought it up, Lapis is concerned as well. Not nearly as concerned as she could be, but that's mostly because if Pearl is right, the Crystal Gems could easily crush the invading Cetagandan forces if they tried.

Lapis doesn't really have a plan either for how she could muck up or slow things down without being obvious, but she can always figure it out as she goes.