The newly svelte lady surely had in mind an about-face, not a pirouette, and was lithely (as she might say) unaware that her expanded metaphor had canceled the sense of her loss (a moroxish pun?)
( ( ( The ( ( newly svelte ) lady ) ) surely ) ( ( ( ( ( had ( in ( ( ( ( ( mind ( an about-face ) ) , ) not ) ( a pirouette ) ) , ) ) ) and ) ( was lithely ) ) ( -LRB- ( ( as ( she ( might say ) ) ) -RRB- ) ) ) ( unaware ( that ( ( her ( expanded metaphor ) ) ( had ( ( canceled ( ( the sense ) ( of ( her loss ) ) ) ) ( -LRB- ( ( ( ( a moroxish ) pun ) ? ) -RRB- ) ) ) ) ) ) ) ) )
(ROOT (S (NP (NP (DT The) (ADJP (RB newly) (JJ svelte)) (NN lady)) (ADVP (RB surely))) (VP (VP (VBD had) (PP (IN in) (NP (NP (NP (NN mind)) (NP (DT an) (NN about-face))) (, ,) (RB not) (NP (DT a) (NN pirouette)) (, ,)))) (CC and) (VP (VBD was) (ADVP (RB lithely))) (PRN (-LRB- -LRB-) (SBAR (IN as) (S (NP (PRP she)) (VP (MD might) (VP (VB say))))) (-RRB- -RRB-)) (VP (VBN unaware) (SBAR (IN that) (S (NP (PRP$ her) (VBN expanded) (NN metaphor)) (VP (VBD had) (VP (VBN canceled) (NP (NP (DT the) (NN sense)) (PP (IN of) (NP (PRP$ her) (NN loss)))) (PRN (-LRB- -LRB-) (S (NP (DT a) (NN moroxish)) (VP (VBP pun))) (. ?) (-RRB- -RRB-))))))))))
As well as being unaware that her expanded metaphor had canceled the sense of her loss, the lady had in mind a ballet dancing class. 
( ( As ( ( well as ) ( being ( unaware ( that ( ( her ( expanded metaphor ) ) ( had ( canceled ( ( the sense ) ( of ( her loss ) ) ) ) ) ) ) ) ) ) ) ( , ( ( the lady ) ( ( ( had in ) ( mind ( a ( ballet ( dancing class ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN As) (S (ADVP (RB well) (RB as)) (VP (VBG being) (ADJP (JJ unaware) (SBAR (IN that) (S (NP (PRP$ her) (VBN expanded) (NN metaphor)) (VP (VBD had) (VP (VBN canceled) (NP (NP (DT the) (NN sense)) (PP (IN of) (NP (PRP$ her) (NN loss)))))))))))) (, ,) (NP (DT the) (NN lady)) (VP (VBD had) (ADVP (RB in)) (VP (VB mind) (NP (DT a) (JJ ballet) (NN dancing) (NN class)))) (. .)))