I think "Her" is right as this could be the objective form of she. Just try reducing it to a simpler sentence and present tense. "He is as tall as her."
No matter what other decoration you add, you're still using him as the subject and her as the object.
Also, the comma after her is technically unnecessary as "prone to slouching" is a dependent clause relating back to "he was"
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no subject
Date: 2008-09-24 19:09 (UTC)No matter what other decoration you add, you're still using him as the subject and her as the object.
Also, the comma after her is technically unnecessary as "prone to slouching" is a dependent clause relating back to "he was"