Am I making a huge mistake?

Well done, you did the right thing.
You are of course in shock and I send you best wishes that you will find courage to cope with all that has to be done.

It's in the bin. Thank you for your support.

I think you must be in shock. It's exhausting. Try to access what little support is out there.
Pay no attention to the card.

Pay it forward and put it into the recycling bin. It’ll do some good elsewhere.

Sorry for your loss. Reach out to Cruise or Samaritans if you feel you need to offload without burdening others. Sending virtual hugs.

Anger is normal in these circumstances but would just rip the card up and bin it as others have said.
The daughter may very well not care about you but if she hangs around give her some of the stuff to do that you are having to deal with alone, delegate, maybe she feels guilty. People often do after a death. In any case she can take over some onerous duties you are not looking forward to doing.
So sorry you are going through this and I hope you continue to post on here where you can say whatever you want and feel it is a safe space.
Take care
🌹🙏🏾

Don’t send it back. Just bin the card.

I am an ex-wife, who has got over most of her bitterness.
It’s very nice of your husband to remember his children, in his Will and I admire you for allowing him to do so.
My children will most probably not inherit anything from their father. His new wife will make sure of that.
And that is why I say I have got over ‘most’ of my bitterness. I still feel upset that he makes no effort to see them. As for his estate, I don’t think my/our children will see any of it.
Sorry for your loss

Be the better person and put it in the recycling bin, then forget all about it. You have enough to deal with at the moment. Grief takes us all in different ways and can vary from one day to the next. This is a really hard time and I am sending you a big hug.

Sorry for your loss,
Just ignore the card. Tear it into shreds, if it helps you.
I hope your step-children are supportive at this difficult and busy time.

I think she was operating by the norms of society in sending a card. You can ignore it without any guilt.

I'm sorry for your loss, and hope the next few months are not too difficult for you. The amount of administration can be overwhelming when you are dealing with grief.

Sincere condolences for your loss 2Understand. My advice is the same as Lathyrus'; just bin it .

I am so sorry you have lost your DH. You must be going through such a sad and stressful time.
I wouldn’t return it (not that I would trust Royal Mail to actually do that); it would just make you look petty.
I send you kind wishes.

If you have not actually sent it yet I wouldn't. As it looks as if she won't be directly inheriting anything she might just be being nice for a change. On the other hand she would probably understand your reaction if you did send it. A person grieving must be allowed to do whatever they need to do. Do whatever you feel.like doing but sleep before making a decision.

Just put it in the bin. Do something unmentionable to it first if you want.

I do recognise that feeling, I truly do. But many years down the line I am content to think that I didn’t give in to it.

I am very sorry for your pain,