Budgie bald spot on chest

[wingslinge]

So I have a budgie that's laid four eggs. They've all since been replaced with fake ones, but today when I went to check on her today she's lost enough feathers on her chest to cause a bald/thin spot.
I've heard that birds often use their own feathers when nesting and that this bald spot isn't uncommon in chickens, but is this normal for budgies or should she be seeing a vet right now?

 

[Lady Jane]

Its called a brooding patch. A photo would help.

 

[wingslinge]

Its called a brooding patch. A photo would help.

I got a picture, you can see how much of her is gone bald and how scraggly she looks:

 

[Lady Jane]

If this were my budgie I would have a vet visit to be sure the skin/feathers do not have mites.

 

[wingslinge]

If this were my budgie I would have a vet visit to be sure the skin/feathers do not have mites.

That sounds like the safest bet, thank you!