Yours is the only part of the relationship you have any control over. If YOU love Grams, don't let others poison that relationship. I would suggest you go to her and give her a true explanation of your actions and motives (don't turn it into an opportunity to bash others). If she still has hard feelings towards you, then it has become her problem, not yours.
I'm just suggesting you not leave anything positive unsaid that will be cause for regret later.
Go in peace.