Cycling for you should remain an enjoyable de-stressor. Always.

Presumably she has no young kids? Still, it might be worth just explaining casually about your personal schedule to juggle things that need to be done vs. what cycling means in the mix of all this. Approach it lightly with always an offer of friendship. But no reason to stop riding with the other cycling friends.

You can't change someone like her at this stage in her life. She may have not yet realized that she is a more social rider.

Or you can consider occasionally to ride just with her in a less competitive manner.

You will change also. Time will tell... but right now your personal schedule is tighter.