What type of LLC?  A single member LLC that has Not incorporated?  A single member LLC that has incorporated as as S Corp?  Or a multi-member LLC?

A single member LLC that has Not incorporated

If all that was done was to change the business from a sole proprietor which only has one owner, to a single member LLC which also has only one owner, you do absolutely nothing on the tax front what-so-ever. When it comes to taxes, the absolute only difference between a sole proprietorship and a single member LLC is the spelling. That's it. Literally! So not one single thing changes on your tax return. But if you want, you can add the letters "LLC" to the end of the current business name.

Since she got a new EIN for the LLC, do I need to complete two separate Schedule Cs? Which is what I have started to do.

@ pcaronsr"Since she got a new EIN for the LLC, do I need to complete two separate Schedule Cs? Which is what I have started to do."

You can if you want. But duplicating the activity of the same company is probably unnecessary and not required. It is still fine to just use one schedule C with the newly issued EIN.