She can access familyfun.com or birthdaypartyideas.com. How much she will spend depends on how much work she is willing to do or how creative she wants to be. I plan themed parties for my kids and relatives. I have spent anywhere from $200-$500 on parties. The fewer kids attending, generally the less you will spend. I try not to do home parties bc they require so much work cleaning and decorating. On party day, I like to help my child greet guests, but love for someone else to take responsibility for the serving, cooking, and entertaining. I also refuse to do the standard Chuck E. Cheese just bc I love for my daughters' parties to be different.
I have an 8 year old and a 2 year old. They have had a Alice in Wonderland Dress Up Tea Party, a Munchkin Reunion at a Farm, A Kim Possible Taekwondo Superhero Party, A BackYardigan Zoo Party, A Don't Forget the Lyrics Music Party, a Kindermusik Party, a Carousel Party at the Mall, an Isis Science Wonder Party, and a Little Gym(nast) Party.
You can cut corners doing the colored party decorations and utensils instead of the character parties. Also, your menu can help you cut corners. I have seen parents spend their money on renting a nice location or hiring a magician, etc. but only serve cake and punch. Or some parents have a nice spread of food and party at home.
The options are limitless. But before planning, you must decide on a budget or things can quickly get out of hand. Also sticking to a theme keeps the party planning in perspective and makes it fun for the kids. Don't forget that the websites will give great ideas and tips for making it all work according to your needs. Familyfun.com or birthdaypartyideas.com are great places to start. Also, in my area there are a few local websites with information on party places and themes just for my area. Your area may have something similar as well. Good luck.