TiN.... How long did Mrs TiN work at said Company? It appears to me that you may have a REAL case of unfair dismissal.
Now, I'm not advocating you follow it up (b'cos I would not like it happening to me!) but Mrs TiN could not be summarily dismissed without proper due process in the form of a disciplinary meeting / suspension with pay. It appears from what you've written, that this Company is a typical small Company that doesn't take too much stock in the Red Tape Bureaucracy BS that ties our hands nowadays.
If that is the case I would imagine there is a fair chance that she acted unlawfully when dismissing Mrs TiN. It really is VERY difficult (as TeddyOnHoliday supports) to dismiss someone, even if they have committed a big NoNo. It makes my blood boil b'cos it means Companies have muppets in jobs, draining others' motivation, causing trouble, proving to be inefficient and a nuisance, just b'cos dismissing them would be a minefield :rant: