I do think this can be an issue for many moms and thier daughters. You want to make her happy, give her anything and everything she may want, but in truth.. she is in a "Brides Coma, drunk on her bridal powers.. "It is not pretty. ... She is not always thinking straight.
She just needs to be reminded that you love her and want her to be happy, but you are not her door mat she can take for granted. You are not her open check book either. She will respect you more if you give her a heads up that the line was way back there and she needs to step back on her treatment of you.
Ask her what word could you say to her to let her know she has gone to far when speaking with you , I like to call it the "safe word". You can say it to each other and you each know the other has had enough, but you will not get mad when it is brought up to each others attention.
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I do special events and I am so sorry this has gotten so out of hand.
MOM, you have rights. You are not an open check book. Did you tell her and her fiance what your budget was at the beginning of this process?
Have you gathered all of the bills and actually put it on paper so they can see where they are on the budget?
I would reconsider some of their decisions and .ask for them to join you in a public place, like a coffee shop. and have a meeting about this.. Show them the original budget and where it stands right now. "Here is a check for what I can afford. It is all yours to spend any way you want, but I am now all tapped out. I do not have any more money for your wedding."
"I love you and I want you to be happy, but you cannot get blood from a turnip and this is all your turnip has. "
Then let her deal with it. She is an adult, so is your future son in law.. They can figure it out.
I am sending you strength.I know it sounds scary, but you are the mom and you are in charge of how you are treated.