She had verizon no {number deleted} and still has Verizon but has a new cell number.
How can I get it . She forgot to give it to me her mother and I don't know how to reach her.

First, I can't believe a mother would not have some other method of contacting her daughter.

Second, you need to not ignore instructions. You posted this in the Forum Help area which has a big red read me first warning that you ignored. That area is ONLY for questions about using this site.

Third, I also have to wonder at anyone that would post someone's phone number on a public WEB board.

So my answer to you is to talk to other relatives or friends to convey a message for you. Or write her a letter.

Did she forget to give it to you or did she decide not to?

If she has internet access,I would suggest sending her an email or if she uses an instant messaging service,trying to contact her via those routes.