If you are using the Desktop installed program you can stay with Premier. All the Desktop programs have the same forms. You just get more help and guidance in the higher versions. But you can upgrade to Home & Business if you want. There should be an upgrade button. I think you can go up to Help-Upgrade.
Yes for your other questions. Turbo Tax will figure any underpayment penalties and help prepare estimates.
Oh is she just a sole proprietor or self employed for it and Neil file on Schedule C in her personal return? Or is she a Single Member LLC?
