Question for parents with girls

my daughter is 9 and will be 10 in a few months. I have tried to give her the talk about having her period so she will be aware of what's going on if it Starts while she is at school or with her dad and I'm not around. BUT it freaked her out. she started getting nervous and scared saying she doesn't want to have it and asking why etc. I don't know where to go from here but I want her to be prepared and educated about it. also asure her that it's OK and suppose to happen...and to add she is asking how are babys made....HELP WHERE DO I GO FROM HERE...ADVICE PLEASE