L.D.
LOL! I was actually concerned about your gramatical errors. Questioned whether you were drunk. Glad to hear that it was just due to the fact that you are not familiar with your new cell phone.
Anyway, I was actually going to respond to your initial post but didn't have a lot of time to do so, so I just let it pass. What I was going to tell you is that I completely understand what you are going through since I've been there myself with a couple of other different relationships. What I wanted to tell you -- and I'll try to make this as short and sweet as possible -- is that, at the ripe old age of 42, I've discovered two truths that apply to your situation:
#1: It is impossible to have a logical conversation with an illogical person. It just won't happen and, even if it appears to happen, it just won't stick. Lower your expectations with your MIL and you'll be better off for it. Trust me.
#2: Never pick a fight with a dog that is meaner than you are. I wish someone let me in on this pearl of knowledge when I was in my 20's. When someone is fair, honest and processes information in a sane rational way, then you can stand up for yourself and speak your truth. But, there are some people out there that are vindictive and have no scruples. These are people that you do not want to be at war with unless you are willing to sink down to their level. But really, honestly, that's no way to live so please don't go down that path.
As far as your MIL is concerned, I'm a firm believer in speaking openly and honestly with people but there's a select subset of the human race that can't handle the truth. But your MIL has already proved herself to be a liar already and if she'll lie about one relative, she'll lie about you. She's also not very respectful about boundaries which means that she doesn't mind conflict or making other people uncomfortable. Basically she is a drama queen and it is up to you not to feed the drama queen the fuel that she needs (conflict and attention) so that she can move on to greener pastures.
In order to not be too reactive to your MIL's borish behavior, you need to find the humor in the situation. What has helped me over and over again when dealing with difficult people is to imagine that they are comic book characters who act in predictable ways (being a jerk over and over again) and, "look, here they are doing it again!" The more that you can disassociate yourself from your MIL's drama making, the better off you will be for it.
As for your present situation, you will have much more peace if you accept her for who she is, smile and keep her at arms length with an iron fist in a velvet glove approach. Acceptance and realization are very important here. She is who she is and it's not going to change just because you confronted her once or twice. Your husband probably realizes this and that is the reason my he is staying out of this conflict. But, with your MIL threatening to come out and stay with you as your uninvited guest, he can no longer stay neutral. He needs to step up now and tell his mom whatever truth or half truth is necessary to keep her from visiting.
But, to sum it all up, just accept your MIL for who she is and try your best not to get entangled in all of her drama making. Do your best to not making her problems (lying, bossiness, lack of respect) become your problem and still maintain the peace at the same time. If this means that you have to be passive-agressive with her, so be it.
Wishing you all the best.
L.