"A higher up told her she wouldn't get her pension when she has been there for 10 years and is able to retire"

Certainly, they can not keep your mother from drawing her pension, since she made 10 yrs, correct?

If not, it will be time to go to battle for it! I've seen a company that tried to do that to an employee. The employee was a client where I worked (financial advisor service industry). We helped get her money for her. Well, helped research what she must do for her to get it, more precisely.

If they offer your mom a lump-sum payment, she will need financial advice. Most companies like Edward Jones, Merrill Lynch, UBS, etc. will help for free (in hopes to win your mom as a client).

I hope all goes well. Hugs to you and your mom.