Can House Elves See Through Invisibility Coaks?

[cynthiaanncoe at home.com]

No: HPFGUIDX 26887

I can recall two instances in which house elves encounter 
invisibility cloaks.  In GoF, Winky is in the top box with Crouch 
Jr., who is wearing an invisibility cloak.  She has her fingers over 
her eyes.  But if Winky can't see through the cloak, Crouch could 
have easily escaped.  Indeed, how is Winky supposed to care for 
Crouch Jr. when they are at home if he wears the invisibility cloak 
all of the time?  He could easily give her the slip at the QWC, or 
even just get lost by accident.

The second instance is when Dobby find Harry sleeping in the 
library.  In that instance, JKR specifically tells us that the cloak 
had slipped off of Harry, so presumably Dobby could see Harry as the 
cloak no longer covered him.  

Does anyone have an opinion on whether house elves can see through 
invisibility cloaks?

Cindy