May be you can tell her something like you can't give her anymore samples, and she has to decide by some date, if she doesn't you'd be happy to return her money, that way you are leaving it up to her. I had some customers who start asking for more and I give it to them only to have them push further. This bride looks like that kind of customer.
string up by her toes over a vat of bubbling sugar syurp and beat her with a marble rolling pin, when you are done dip her up to her rude little mouth in the sugar and let it harden 
Then give her deposit back and tell her to get her cake somewhere else. You will never be able to please this woman and if you think the day you drop off her cake will be the end of it you are wrong, she'll be back complaning about it and asking for her money back. There are other cakes this is so not worth it.
She is having "buyers remorse". It always happens on big ticket or event items such as buying a home, planning a wedding, determining what college to attend.
Be firm but polite and give her great service as you remind her that you are the expert and are offering her the "Right" choices. Sometimes you have to have a firm upper hand to deal with clients and limit options, dates, decisions, and prices so that they are not overwhelmed.
HTH
I would be tempted to give her a default wedding cake if she doesn't make up her mind immediately. Default wedding cake = white cake +white butter cream frosting +white decorations in the size needed. Then she can't say you ruined her wedding by quiting on her at the last moment.
Narie
That sounds like a good idea
May be you can tell her something like you can't give her anymore samples, and she has to decide by some date, if she doesn't you'd be happy to return her money, that way you are leaving it up to her. I had some customers who start asking for more and I give it to them only to have them push further. This bride looks like that kind of customer.
I totally agree - decide what you want to do, stick to it, and then tell the client this is what is going to happen. First of all, she needs to confirm the contract by giving you the final payment! Put the ball in her court, and if she decides to cancel the contract, then it is her responsibility.
Good luck!
Nicole
I use the wilton 2x4 I believe it is rectangle pans for my tastings, I use extra batter and keep some in the freezer, when the bride calls I ask her which 3 flavors she wants to try. As of yet no problems, I've had nice girls thus far, but I know there is one out there to be my Bridezilla one day. Good luck, I agree stick to your guns, I had a hard time with it but the further I get into this the more determined I'm becoming. I'll let you knock me down, but I won't let you walk on me. Hehehehehehe........... I think sometimes even money isn't worth what some people expect out of you, keep your respect, and good business sense.
string up by her toes over a vat of bubbling sugar syurp and beat her with a marble rolling pin, when you are done dip her up to her rude little mouth in the sugar and let it harden
Then give her deposit back and tell her to get her cake somewhere else. You will never be able to please this woman and if you think the day you drop off her cake will be the end of it you are wrong, she'll be back complaning about it and asking for her money back. There are other cakes this is so not worth it.
I like your way of thinking. 
So glad you are not afraid to say what most of us were thinking.
I don't know how badly you need the money, but I got into doing cakes because I enjoyed it.... there's no amount of money worth putting myself under that kind of pressure, I think she sounds like trouble.
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