Can she go to the UK High Commision in Delhi...
http://www.ukinindia.com/visa/visa.asp
Ask for an emergency Visa... Saves having problems in LHR ...
Since she is a US resident and far as I can tell has not been deported or forcebly removed from the UK an interview shouldn't be needed.
[This message has been edited by NickP 1K (edited 06-30-2003).]