My 60ish mom said it felt like someone standing on her chest and ache in right arm. Is she ok?

Might be heart attac. "crushing" chest pain has to suggest a heart attack first and foremost. It may not be, but that has to be considered promptly. Classically, heart pain goes into the left arm, but being on the right side is not unheard of. This type of complaint requires prompt medical attention.
No . These are typical signs of a heart attack. I would take her asap to have it checked out.