If your daughter is eating well, there will be no need supplementing with folic acid as she will get it from food rich in folic acid e.g. Vegetables. If you are not sure, you can give folic acid but make sure it is prescribed by your Paediatrician.

Yes. It is okay for a breasfeeding mum to continue with prenatal drugs: multivatamins and iron supplements..

According to National Health Service (NHS), UK, You should take a 400 micrograms folic acid tablet every day before you're pregnant and until you're 12 weeks pregnant. Folic acid can help prevent birth defects known as neural tube defects, including spina bifida. So, try ask your doctor for more details

Normally, you should take a 400 micrograms folic acid tablet every day before you're pregnant and until you're 12 weeks pregnant. Folic acid can help prevent birth defects known as neural tube defects, including spina bifida.

You can register for your antenatal next week, bear in mind that your doctor/nurse will write a list of prenatal vitamins and drugs for you based on your initial test and clinical history. I wish you a safe pregnancy journey

sure I think so. It's folic acid. If your doctor prescribed this medication, considering he/she has more medical experience and education than the majority of the women on here, I would bet it's safe to take. And if you're questioning it, why don't you call the doctor to voice your concerns?
If you can't trust your Healthcare provider and doubt their abilities, then why not just switch? I'm almost positive they would not prescribe you anything that could potentially harm your baby.