Kim,

Yup, she's in heat alright. Don't worry though, the yowling only lasts about a week. DO NOT under any circumstances let her out!! But you already know that! When is her appt. to be spayed?? The only advice I can give you is to get a set of ear plugs and a bottle of Jack Daniels and ride it out. Once she's fixed, you'll never have the problem again.