I bet you can find plenty of quotes stating why she thinks she lost, Russian interference or otherwise. The fact is she’s stated she lost, for whatever reason, numerous times. She even wrote a book about it.
"I couldn't get the job done, and I'll have to live with that for the rest of my life," Clinton wrote in the memoir.”
And this interesting tid bit.
“Defeated candidates don't necessarily attend the inauguration, but Clinton was in a unique position.
"But I'm a former first lady, and former presidents and first ladies show up," she said. "It'sr part of the demonstration of the continuity of our government.”
https://www.cbsnews.com/amp/news/hillary-clinton-what-happened-sunday-morning-jane-pauley/