<human>: Okay, I apologize in advance if this comes out like rambling. 

I have been engaged to my college sweetheart since August 2012. We have set a date and have a lot of things already planned for our wedding in June 2014. My fiance is currently in medical school and is still financially dependent on his parents while I work full-time and am financially independent. 

When it comes to our wedding, we picked a neutral location and my parents offered to pay for a large portion of our wedding (yay!) and my future in laws also said they will contribute. 

After dealing with this woman for 4 years it is now crystal clear to me that she is a textbook narcissist. My fiance is aware of this but he and his siblings and dad have taken the "be quiet and appease" approach to her for years so she is very used to getting EXACTLY what she wants when she wants it. I have no idea how to deal with her without putting a lot of stress on myself. I can't just let her keep winning these battles because I am not a doormat and I want our wedding to be what my fiance and I want, not what she thinks will make her look best. 

Her biggest use of manipulation is with money, she keeps offering to help us with things like an extra $300 here and there but won't stick to a firm number when it comes to wedding expenses. I would just say then we will budget without your money but then she will say she's hurt and try to guilt-trip us.

I could just say, traditionally its the brides parents that contribute so we don't need/want your help. But I don't want to break an already fragile relationship with her when I will be dealing with her for 30+ years and she will be the grandmother to our future children. 

So really I am just asking for advice to set boundaries, dealing with her manipulation and how to make sure my dad or anyone at my wedding doesn't strangle her. 

There are a lot more examples of her trying to push her way through everything but this would end up being a novel so I'll spare you all.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: My future MIL is coo coo for coco-puffs and is seriously putting a downer on my wedding!