Chosen Solution

I have a 2001 Monsters Inc Babblin Boo doll from 2001 I’ve found her in my mom’s shed and she is a childhood doll I’ve had since I was 7 years old and I cleaned her up and fixed her hair and washed her clothes with my mom’s help and we put new batteries in her and she won’t talk sing or giggle anymore and I heard the only way to fix old battery operated is to replace the tiny speaker and put new batteries in them,How can I do that without damaging her,She looks like this. By the way this is not my doll just an image from eBay to show you what she looks like. https://www.ebay.com/itm/DISNEY-MONSTERS… Update (05/26/2019)

Here is her torso (On top) and speaker on the back of her and (On the bottom).

So I would check to see if the battery terminals are corroded, If they are clean them, also not all the time toys like these need speaker replacements, It could be a loose battery wire that needs to be resolder. Sometimes plastic will break up inside these types of push toys, so when you press her tummy, the plastic will move, but not make a signal. Try leaving batteries in the toy for a while, since you found her in your mom’s shed, who knows how long she’s been out there, maybe the batteries need to warm up abit, and she’ll start working again.