Survivor Benefits Mom 60 years old

Hello, I am a little confused and worried as my mom was told that she cannot get survivor benefits. My mom was married to my stepdad for 8 years and he passed away in 2016. My two step-brothers were getting the survivor benefits but they are both over 18 years old now. My mom turns 60 next February, will she be able to get the benefits? She works full-time. Thank you!

UPDATE: Thank you all for your insight as it was very helpful! We ended up talking to someone from SS and they said she cannot get it as she makes more than the 23,000 limit.