I'm sorry that you're finding the relationship with your m.i.l. so difficult Goldie
. There's no excuse for making someone feel uncomfortable at best, or really upsetting them at worst just because you can. I've said that because although I'm wondering why she might be behaving in this way, I didn't want you to think I was condoning her behaviour.
You say it's your second marriage, it it your husband's 2nd marriage too? You say you have 4 grown up children, if your husband was in a previous relationship, did he have children? You say she has a problem with your size and thinks you're lazy, I've taken that to mean you're curvy as opposed to skinny (me too). You've said you're demonstrative (huggy), is your husband a huggy person too? If he is, was he like that when you got together or has his 'huggyness' developed in line with your relationship?
His mum may be finding it difficult having a d.i.l. 5 years older than her son whose been married before, especially if he's never been married. She may resent you having children from a previous relationship especially if she doesn't have any GC at all, or none from her son. If your husband's parents aren't the demonstrative type and he wasn't until he met you, perhaps your m.i.l. just ins't used to and/or comfortable with public displays of affection. I've nothing to say about what size you happen to be, what does that matter, but to assume someone who is 'bigger' is also lazy is as offensive as it is insensitive.
As I said, I'm not condoning your m.i.l.'s treatment of you but just thought if you could understand where some if not all of her resentment stems from, you might be able to find a way of working through it and not have to spend all of your time trying to avoid her.
Good luck