I actually think its the opposite. If she was allowed to follow her preference she would do nothing other than bask in Shenhua's light, but because she's the Diao Matriarch she goes out of her way to shield her clan from her love's destructiveness. I'm not sure Shenhua has anything to do with it really, more that Linqin has a stronger drive to fulfill her assumed responsibility than we've either seen prior to this or at least given her credit for."She saw shading boughs cast upon tightly grown flowers and shoots, apathetic of their existence but casting life giving shade from the searing light all the same."
This does not sound like she's primarily a Matriarch to me. Going just by the description given at the end of the this update I'd almost guess she only functions as Matriarch because it's useful to Shenhua.