There were no motherships in the Chinese Federation.
Well, to be more specific, at least there were none employed in publicly visible active service. If they had a few secretly under construction, I wouldn't have the slightest idea then.
But the main reason as to why there weren't any visible ones in the Chinese Federation was very simple.
They could not afford it.
They could not afford to design it, they could not afford to build the industry that would be needed just to build it, they could not afford to build the maintenance yards and train the manpower needed to maintain the maintenance yards, and they could not afford to do all of the above for the golden mechas they would need to fill the mothership with.
A mothership was that expensive to build.
And within the context of the Federation's situation, it was also extremely useless.
Its money would be better spent chasing after the development of golden mechas and strengthening the spine of its armies.