Deep emptiness (nothingness) while meditating When meditating mom claims that she enters in to deep emptiness and she would reside in that emptiness for the whole period. She also says she can’t even feel her breath or her self. She’s bit lost ATM. Any suggestions on this? Any reference preferably in Sinhalese if possible?
Provided that your mom is well and healthy, your description fits with the buddhist perception of emptiness (sunyata). It's not dangerous, and the experiences could be the result of a progressed concentration thanks to meditation.

In short, sunyata can be described as a state during meditation - just like you described it - but it also has connections to a way of perceiving the world, in a general sense.

Below is a link that discusses the phenomenon, as well as referring to relevant suttas:

https://www.accesstoinsight.org/tipitaka/mn/mn.122.than.html

(Perhaps an online translation service can help to display this content in sinhala)

Lastly, an unsolicited advice would be to consult a buddhist monastery, where you might be able to recieve some more substantial guidance from experienced practicioners.