Yes.
They have to send a letter inviting employee to disciplinary hearing and tell them they have the right to be accompanied and warn them they may be dismissed; they have to hold a disciplinary hearing and then give them a right appeal.
Gross misconduct simply means you can dismiss someone and ask them to leave right away without working (or paying them for) their notice. You still need to do the above though. The employer would also have to show that is had a reasonable belief based on a fair investigation that the employee did the act they were accused of. There are also arguments over what "acts" can amount to gross misconduct (usually things like stealing, turning up drunk to work, violence at work etc).
With small companies they can sometimes get away with small procedural "breaches" such as having the same person hear the appeal as made the dismissal but ideally they would get someone in from outside and would have to explain to a tribunal why that wasnt possible.
Also just because a dismissal is "procedurally" unfair doesnt necessarily mean the employee will get compensation for unfair dismissal because the employer can argue that even if the procedure had been totally fair they would still have dismissed the employee and therefore the compensation should be reduced (often to nothing). Therefore it isn't worth suing.
What I would advise however is she writes down a note of what was said and dates it and signs it. This would be very useful in the future if she was dismissed because it shows that any disciplinary process was predetermined and a sham process. In fact I would tell her to start a diary and write down anything like this.
She needs to have been employed for at least year at the date her employments ends to claim unfair dismissal.
She also must definitely be an "employee".
Hope all that helps!!