I agree with Anya. I would wait until she gets in touch. Carry on as normal and see what she does. If she does contact you then arrange as others have said in a neutral place. See what she has to say. See if she looks like she is sorry and remorseful but don't throw your arms open wide and welcome her back wholeheartedly. She will have to work hard to win her place back in your family and in your heart and that of your son and husband too.
My DD has disowned me and my son, we aren't invited to her wedding in September, we haven't to see her sons or send gifts or cards. This is not the first time she has done this so fine. This time I have switched off, I am carrying on with my life and I refuse to be upset by such an ungrateful woman any more. I have done my best, brought her up on my own and if she ever wants me in her life again, she will have to crawl over broken glass to get to me. Call me hard but that woman has had everything off me including blood sweat and tears. I am now left disabled with really bad health and she does not care one jot. I am better off without her. And her children truth be told. She is bringing them up without manners and to be rude so I would only go and put my foot in it if I did see them. I am happier now with the people who really care about me and I am not angry all the time or feeling agitated by the situation. I have better relationships with others because she lies all the time and so it was making me suspicious of everyone else which has now been put to bed with not seeing her since last May.
You look after yourself and that lovely son of yours. My son has stood by me too. He might be a pain in the backside from time to time but he has my back and he loves me, I know that. Like Jings says, treat him and your husband to something nice. They might need the reassurance that you have appreciated what they have done for you. Although I am sure you have told them many times. Just be careful of giving back to your daughter and then her doing the same thing and then having to rely back on your son and husband. That would not be fair. Tread with great care. You are the important one now. She has had her chance for ages to make up.
It is hard because we are not made this way, to protect ourselves against our own but in some cases we have to. It feels unnatural and as though we are hard. Just don't give her anything easy. Keep her at arms length.
I would, anyway. Take care and let us know how you go on. Lots of 