to be fair, the niece clearly had intentions to bring her story to the public when went on TikTok to air mess out
sometimes healing for people simply means getting the word out and taking things from underneath a rug - letting people hear their story.
from what i remember (and i could be wrong, i'll have to listen back) but im pretty sure the niece mentioned she went to counseling to work through things
when someone's been violated, they don't wanna feel like they're helping to hide their violators. especially as they get older. they may even wanna see them (rightfully) lashed and held accountable in some way by the masses. it sometimes turns from shame/embarrassment when they're younger - to anger....then to a reasonable thirst for revenge (i hate to use the word "revenge" given its negative connotations but i'll prob think of a better word later lol).
if the niece was a minor - too young to fully consent and understand what she was doing by getting on a larger platform to share that would be different. but she's an adult who actually wanted to put her story out there. tamar was doing the right thing for her by allowing that, even if she had her hidden motives which were self-serving.
sometimes impact will override intent, this woulda been one of those cases.