rabies shots

Hello,  We have a little cat (7 pounds) who needs to get from China to America this summer. We've had an emergency and need to move home on June 29th. We got Scout's rabies shot on June 11th. We're really worried about her being under the 30 day requirement for a rabies shot - if we're able to self-quarantine her, that's no problem, but I'm nervous about it. We were also blown away by the tiny size of container Delta told us was acceptable for pet-in-cabin travel. Even though she's little, 17x12x8 still seems a bit inhumane...?