When someone has been in post for a year or more an employer can still dismiss them without good cause, but the employee can then seek compensation (and/or their job back) through an employment tribunal. (It should be noted that an employer can never be forced to re-engage the services of an employee. If the dismissal was ruled to be 'unfair', the empoyer could simply opt to pay compensation instead).
If it may be assumed that this incident was not at the end of a sequence of written warnings, the only valid reason for dismissal would normally be one of 'gross misconduct'. It seems unlikely that an employment tribunal would regard your daughter's actions as such, thus making her dismissal 'unfair'. An alternative argument that an employer might put before a tribunal would be that your daughter's actions had resulted in a 'loss of trust' in her ability to do the job. (Such an argument is normally used, for example, when an employee does something out of working hours which makes them unsuitable for continued employment in their current post).
See here:
http://www.direct.gov...Dismissal/DG_10026692
and
http://www.direct.gov...b/Dismissal/DG_175834
and
http://www.direct.gov...tribunals/DG_10028122
(In particular, note the ACAS Helpline number. It can take ages to get through but it can be worth the wait).
Chris