Did they get blown off in the bushes or did they burn up in the spin explosion? Was she always wearing her outfit under her civilian clothes?

Here are some looks at Lynda Carter as Diana Prince.

In the WWII era episodes, Lynda has her hair pulled
back in a bun while in uniform. Her ears are completely
uncovered in this scene. She is so lovely:
282947

Once more in uniform; this time her hair partially
covers her ears. Beautiful young woman:
282948

Moving on to the then-modern day adventures,
Lynda is seen in wonderful outfits and, as Diana,
commonly wears her long hair in pretty ponytails:
282949

As she did before in the Season 1 stories set in WWII,
sometimes Lynda covers her ears partly while her hair
is in a bun, sometimes her ears are totally visible. The
earrings complement her beauty, a style she could not
wear back when in her WWII uniform:
282950282951

Here we see the great length of Lynda's ponytail,
really beautiful and so nice for her, gorgeous long hair:
282952

Lynda is a very lovely lady!
282953