Yochlol have a Shapechange feature which reads:
Yochlol can use its action to polymorph into a form that resembles a female drow or giant spider, or back into its true form. Its statistics are the same in each form. It reverts to its form when it dies.
If a Yochlol has taken damage and it polymorphs into a different form, does it heal back to full hit points similar to the Druid's Wild Shape ability?