If Sevanna was taken as a servant by the Seanchan. Then if you take into account that Seanchan slaves can gain some power and influence over time. Then could Sevanna  be a threat?

I rather expect her to sleep her way to the top. Or well not the top but fairly high up anyway (although how old is she?).

I'm not sure what the process of a Seanchan property gaining rank is but I have the impression that the high-ranked ones (such as Selucia) were raised and trained for the position from a very young age. And even if it was possible for someone who was made property at an adult age to gain such a position it would require them to have the patience to play the system, and I can't see Sevanna doing that, she's too delusional.

Not to sure why the Seanchan would bother to keep her, she can't channel and the only slaves I can think of they kept who couldn't channel were rulers of the nations they took over.  Sure the Aiel fought the Seanchan but the Aiel ruled no nation so I would think the Seanchan would view them more as roving bandits.   

Not to sure why the Seanchan would bother to keep her, she can't channel and the only slaves I can think of they kept who couldn't channel were rulers of the nations they took over.

 

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The Seanchan took both damane and da'covale.

Not to sure why the Seanchan would bother to keep her, she can't channel and the only slaves I can think of they kept who couldn't channel were rulers of the nations they took over.  Sure the Aiel fought the Seanchan but the Aiel ruled no nation so I would think the Seanchan would view them more as roving bandits.   

The Seanchan seems to keep all people they capture; and they seem to find some role for each of them.  Only exception seems to be saidin channelers; the Seanchan kill those.