NTA. Running is an individual sport. No one is expected to wait for anyone to complete a race. She had the time to prepare and set her own goal and she failed. That's not your fault. My SO also started running while I'm training for a 10K in september. We begin warm up together and after that I go for my pace and she goes for her.

First you need to grow an Argania. So yes if your backyard is a semi desert in harsh conditions with temperature up to 50° celsius.

I know that this not related to the knees and it's just from personal experience but, running actually reduced my sciatic pain. Especially when I started my training to the point where I'm almost cured now. Kudos to my physicist who helped me to get back on my feet and teach me what to do to maintain a physical activity despite the pain.

Any FOSS alternative to Macrodroid?

It's Richard Motherfucking Stallman