Anything is possible - our task is to find out the facts!!
It will say widow if she HAD married previously, and then for some unknown reason reverted to her maiden name, but at present we are thinking she was most probably still single.
Either way the cert will help - no good assuming one or the other till we know.
IF it is spinster - then it is very straitforward, she never married any of the previous ones, just used their name for a bit and had a few children.
IF it does say widow, then we are back to the task of finding previous marriages, which so far has proved fruitless and lead us to believe she had not previously married.