Options after grievance: ask the expert
A woman on maternity leave has the right to return to her job at the end of her maternity leave, unless it is not reasonably practical.
What you are describing is likely to be unlawful, automatically unfair dismissal and sex discrimination.
I suggest you get legal advice immediately. Check if you have legal expense insurance on your home contents insurance policy and insist on your right to choose a solicitor who has experience in maternity discrimination.
Time limits are very important. Time is likely to run from the date your maternity leave ended and your claim must be received by the employment tribunal within three months less a day from this date. This time limit will apply even if you are still appealing the grievance appeal.
Please be aware that it's not possible to give you comprehensive advice without speaking to you. If you haven't already had legal advice, I suggest you do so now and promptly.
Vanessa Wheeler is a solicitor at Setfords Solicitors. Please contact her for legal advice on business and commercial law, including franchise and contractual matters. She can also assist with employment matters.