True Left

I don't know why you say you are not forcing her to not have a child. Those like her need to be prohibited from reproducing.

Strictly speaking, I don't think she is forcing you to live outside Earth. She would probably be fine if you continued to live on Earth while she settles outer space. Settlement of outer space does not require everyone to do it simultaneously in order for it to succeed. Refer to:

https://trueleft.createaforum.com/true-left-vs-false-left/true-left-breakthrough-folkish-imperialism/msg10902/#msg10902

In general, let X be an idea. If X is something that can succeed only if everyone practices it, invasion to impose X is justified. Whereas if X is something that can succeed with merely a fraction of people practicing it, invasion to spread X is unjustified (but invasion of practitioners by non-practitioners to eradicate X is justified!).

https://trueleft.createaforum.com/true-left-vs-false-left/true-left-breakthrough-folkish-imperialism/msg14823/#msg14823

Just living in a superior way ourselves is doomed to fail when others are not also living the same way. We must crush the inferior first, and only afterwards get back to living in the superior way.

Settlement of outer space definitely falls into the latter category, which is why it would be justified for non-spacefaring countries to invade spacefaring countries for the sake of eradicating spacefaring.

Also, you need to argue against Yahwism itself:

We could be the only sentient life in the universe.

She obviously does not consider all the non-humans on Earth to be sentient.

It is our duty to spread it.