The childminder cannot look after your son until her own child is over 1 year, that is Ofsted ruling.
I would be a little apprehensive if the childminder only has one baby of her own, unless she has had previous childcare experience, because as you say, she would have two close in age, both at very demanding and time consuming ages. She is really still finding her way with her own child, we all know that the first one is the one you practise on and get it right second time round!
Your own baby is going to need a lot of time to settle in as he is at the age when separation anxiety starts to happen.
See how she is with her own child, if she appears relaxed and at ease and confident that she can cope, it could be a very positive thing for your son
I'll post the list of things top ask for your benefit.
How long have you been working with children?
What training have you had? Any qualifications? Are you part of a network, done a quality assurance programme, look at registration certificate, insurance details, business use for car. Contracts and record forms
Do you enjoy being with children and why?
Can I look around, see the rooms and outside play space? If there is no outside play space - how will you make sure my child gets the chance to play outside?
Where will my child rest?
What kind of food and drink will you give? Can I see a menu?
What will my child do all day?
How do you encourage good behaviour?
Will my child be with a regular group of children? How old are they? How will their timetable fit in with my child?
How will you make sure I know how my child is getting on?
What hours is she open?
How much does she charge?
What about when my child is sick, holidays, days off
What do you do in an emergency?
When was her last Ofsted, can you see the report?
Top 10 Quality Pointers
When you visit possible childcare options, look for these Quality Pointers:
Are the children calm, safe, happy and busy?
Do children play and talk together?
Is the childminder listening to the children and answering them carefully?
Is the childminder friendly and proud of her work?
Is she joining in joining in with what the children are doing?
Are there lots of fun activities planned to help children learn and play? Can children plan some of these activities themselves?
Are there plenty of clean toys and equipment for children to use?
Is the premises clean, well kept and safe for children with a fun outside play area (or will the child go to parks and other places regularly)?
Do parents have plenty of chances to say what they want for their children?
If there are other things you want to know, don't be afraid to ask. Good childminders expect you to ask questions and will be happy to answer them.
Always take up references. You could ask for names of other parents to talk to about the service
Listen to your child and find out more if he/she is unhappy
Always trust your own feelings about your childcare - you know your child best. Good luck
Most childminders who are proud of what they do will be pleased to share everything with you.
I hope you get sorted out and are happier about it all soon.