After having thought about this all night, I have come to several conclusions:
1) There is no "negotiating" with my sister. Sad to say, but it is what it is. That's why she tried to hide the trust from me and tried to convince me to give up the position of trustee.
2) I have a trust that is extremely detailed and over 47 pages in depth
3) I have this stupid amendment which replaces only 3 paragraphs of the entire trust, and it is contradictory to everything included therein.
So, as was suggested by OHRoadwarrior, I am going to contact an attorney and see what our choices are. Since the amendment is completely contrary to the entire original intent of the trust, and because it causes so many contradictions and problems, it is going to have to be reviewed by the court no matter what happens (unless all parties agree to dump the amendment). It is clearly above and beyond my own power as the trustee to decide and act upon. So, once the court has reviewed it, some sort of decision will have to be made.... and that will be to either toss all of the other beneficiaries out on their ear, or to scrap the amendment and stay true to the original intent of the trust. So, the court will have to make a decision, and whatever that decision is, it is what I will stick to. Because of an extremely hefty "no contest" clause contained in the trust (which my sister has already pointed out when she was trying to bluff me into giving up the trustee position), I don't really believe this will turn into an all out legal battle. I could be wrong, but I don't think so. She and her husband like their money too much (in my own opinion and estimation) to spend $50k trying to fight the trust knowing that it flat out states that anyone who fights it loses everything and is only allowed $1. The only person allowed under the terms of the trust to question the trust is the trustee; and that is only to the extent of not understanding something and needing the court or some sort of a neutral mediator's clarification.
She had read the trust, and knew what it had in it, and DIDN'T want me to see it. That tells me that she pretty much knew her best, and possibly ONLY chance to come out on top was by getting me to give up the trustee position.
As far as blowing up the family over this.... I don't see that happening either. Divisions among the family happened a very long time ago..... so no matter how this plays out, I don't see much of anything changing.
Now then, there is always the possibility that an attorney will look at this thing and say "she doesn't have a snowball chance in hell", and if that is the case, I may go to her first and see if she wants to back down and accept the amendment as being stricken. I already think she believes that to be the case, and gave it her one last "hurrah" to try and screw everyone out of everything ..... I just don't think she knows that I know it.... But if that is what an attorney states to be the case, then I will approach her and the others and state that and see where she stands. If she backs down and is willing to sign off, then we can avoid the court and all of that mess. Looking at how everything is, I believe that is the best possible scenario. I guess we shall see tho...
And no, the trust does not provide for any beneficiary to dispute the trustee, a court's decision, the trust itself, or anything else at the expense of the trust. It only provides legal fees for the trustee.