Sorry I have only just noticed your post. It will be a bit difficult to find accommodation for 8 women as most decent hotels wont take the booking as its just easier. Most groups are fine but for small hotels it might be difficult to deal with a group that might come in late and disturb other guests.
Best to search for hotels in Blackpool that take staggs and hens. Then look for Visit Britain or AA Accreditation. That way you will find somewhere that has passed standards and is clean and comfortable.
Sorry I couldn't be help earlier and I hope you did find something and had a great time.