My 2.5 year old just discovered finger sucking and she is a million miles away all the time now. Should I do any thing?

This started 2 weeks ago. She really took to it quickly. Her fingers are getting chewed up. I can’t imagine telling her to stop is going to accomplish anything. But it feels like she’s is completely checked out when in her thumb sucking state. There’s addiction in my family and it this behavior feels very similar to other compulsive self soothing behavior I’ve seen in my family.She does have a molar coming in which seems have have triggered this.What is the current scientific/psychology view on this behavior? via /r/Parenting https://ift.tt/2q3TjAa