According to Ofsted, the over-minding of too many children can be a signal of how to tell if someone is an unregistered childminder.
This must have been reported to Ofsted by someone, who may have had cause for concern.
If she is registered - have you seen her certificate station how many children she may mind - this includes any of her own under 8. How many children have you seen there? Remember, if she is overminding then her insurance is void.
I have heard of people occasionally overminding, Ofsted have visited, but they have not had to stop, just been warned to comply with registration and surprise visits made to check up.
This is what Ofsted say about visits other than inspections:
What other visits might be made?
We may visit at other times, for example:
to check on actions given at an inspection
to consider a request to vary the conditions of your registration
because something about your registration has changed, for example you have moved house
because we have received a complaint from a parent or other person that raises concerns about whether you meet the requirements for registration - most likely
You do not receive a report from these visits. You will receive a letter that sets out the outcome of the visit. This may include actions and/or recommendations to bring about improvement.
Following a visit arising from concerns we will tell you about any enforcement action we intend to take. In extreme cases this may include prosecution and/or cancellation of your registration. Where necessary, we may issue a notice of intention to vary, add or remove conditions applying to your registration or to cancel registration. You have the right to object or appeal against any notice that we issue. We publish the outcomes of all investigations where we, or you, take action to ensure you meet requirements.
The best thing to do is ring NCMA helpline, parents are welcome to make enquiries and seek advice, the number is 0845 880 0044