
It's only being realistic, you know... As far as their knowledge goes on how to deal with the consuming, those are the only options she has right now. Or she'll have to miraculously find a way to make multiple large cold coins, which for someone of her age and standing it pretty much impossible, normally. If anyone could do it though, it would be her, because of her knowledge of our world. Only Lutz knows of that though.
As for making her work for them, I can't really blame them. They're not bad people so they would never treat her badly. But they ARE still a merchant family. Of course they'd want someone as valuable as Maine working for them. It would make their business prosper to incredible heights.

She herself was sold to a noble family in order so that she might live. The only difference is that she was sold with the anticipation of her becoming a second or third wife, because her family has power and wealth. If even the grand-daughter of the guild master was sold off, what position would a poor commoner find themselves in?

I imagine giving that the slightest emotional thought threatens their life
She couldn't be the main wife responsible for producing an heirs. Living
their lives as slaves-second or third wives is as close to normal as they
can get. Like Frida said marrying for love is impossible for them because
theres nothing more emotionally stressful than love.
I'm not sure I like this rich friend. That's just not a nice thing to say that she shpuld be a slave for a noble family. Your "friend " just told you to be a slave.And they even wanted to make her work for them......like damn