Are you using ProSeries to prepare your sister's tax return? Because that is what you found on the internet = a specific software in use by specific persons for a specific purpose.

Yes, you will report the sale of the house on her tax return. The software will expect the acquisition date, basis, and date of sale and sales details.

Yes, you will need to report any giving that she does, if you are preparing her tax return, for amounts exceeding the gift limits for the year she gives money away.

If you are not preparing her tax return, then none of this matters, because this is not the place to get personal tax advice. It's a software program user community.

Your log in username you created to post here will work at the Turbo Tax community.