The essay "Ain't I a Woman" is quite impressive. For me, it says that the writer is fed up of being a slave and being treated as a second class citizen in the society. She had many children and they were all sold off into slavery. As for me, I would have not been able to continue on after having one taken from me.
Explanation:
A witness would be someone that has experienced something at first hand, having saw something from a different perspective. An ally is someone who is acquainted with you, or someone you could trust. A witness cannot be an ally if you are against their side in some form or way. A witness can be an ally if it is your best friend or someone you trust to prove you innocent.
Basically, a witness is a neutral term that describes someone that saw something. While an ally refers to mutually acceptable.