Looking For An Ally
There was also the fact that Kate and Meghan had a complicated dynamic. When the latter became a part of the royal family, she probably hoped that she was going to find an ally in her new sister-in-law.

Looking For An Ally
Too Busy
Back then, Kate had been pregnant with Louis. She probably had no idea that she was supposed to help Meghan out. The Duchess of Cambridge was already dealing with her own responsibilities and children, so she did not have a lot of free time. Maybe Meghan thought that she was being snubbed instead!

Too Busy