I agree with this since Genghis Khan was most benefited by the Mongols and would consider them civilized.

I think she adopted them just for more loyalty. The sons she adopted became her biological son's (Genghis Khan) close advisors.

Why did the Khan gift Marco Polo paizasc and allowed him to safely go back to Venice?

Hoelun ended up adopting orphans during her son's conquests and had a great love for them.

When Hoelun's oldest son attained the title of "Genghis Khan" he rewarded his mother by giving her control of 100,000 people and 4 military commanders.

Hoelun was the mother of Genghis Khan and supported his efforts of conquest.

The Mongols sometimes wiped out civilizations of entire towns after defeating their armies.

The Mongols forcefully recruited people in places they conquered that were useful such as craftworkers, miners, and anyone that could read or write.

The Mongols were uncivilized because of their use of psychological warfare to terrify their enemies.

The Mongols were civilized through their successful ruling. They were successful because of their understanding of centralized power, influencing the nations they ruled over to do the same in the future.