It is unlikely that the numbness in her leg was caused during the surgical procedure on her elbow. This sounds more likely to be related to some systemic disorder. You better to look into the condition related to her retardation and the link with the surgery.
Hope this is of some help to you.
All the best.
Alla Cranham, MSc ABMT,
Registered Homotoxicologist
Mercury House
Northgate
Nottingham
NG7 7FN
Tel +44(0) 845 450 7316
Mob +44(0) 77361 47458
Fax +44(0) 115 9163109
http://www.in-vivo-health.co.uk