Probably Elizabeth Christine, Holy Roman Empress
<bdi><a href="https://www.wikidata.org/wiki/Q52149280" class="extiw" title="d:Q52149280"><span title="German engraver and etcher">Gustav Adolph Müller</span></a>
</bdi>
<a href="https://en.wikipedia.org/wiki/National_Portrait_Gallery,_London" class="extiw" title="en:National Portrait Gallery, London">National Portrait Gallery</a>: <a rel="nofollow" class="external text" href="https://www.npg.org.uk/collections/search/portrait.php?search=ap&amp;npgno=D32896&amp;eDate=&amp;lDate=">NPG D32896</a>