Lady, EVOLVED 
does T·E·I seriously not have a single word of current guidance on how to classify maiden names
<persName>
<forename type="given">Margaret</forename>
<forename type="unused">Hilda</forename>
<surname type="birth">Roberts</surname>
<surname type="married">Thatcher</surname>
</persName>
?
@gaditb if you check the URL this is outdated documentation in the Vault, not current recommended practice
