Recovering Spanish Citizenship?

Hi, my sister was born in Spain but has lived most of her life in Trinidad, she recently applied for her spanish passport and got it. She now wants to apply for her children's spanish passport but they told her she lost her nationality and therefore cannot apply for them. What can she do? How can she recover her nationality and hence apply for her children? Is it possible to have a valid Spanish passport and not be a Spanish citizenship?

She contacted the embassy and they were of no use, they told her to contact the embassy in the UK and the embassy in the UK told her to visit them but she cannot travel to the UK with her Kids because they don't have an EU passport...they have her running in circles.

Can anyone be of any help here...your help, will be greatly appreciated.

Lpt

Hi LPT. Could you let us know why your sister lost her nationality? This is very important in order to see whether she is able to recuperate it.