A woman in this age can be pregnant or not.Only with the pyshic way man and woman with no condom. Not the way with science that can done miracles.
Conception (pregnancy) can occur from menarche (the onset of ovulation / menstrual period) to menopause (cessation of the menstrual period). The CDC lists the average age of menarche as about 13 years (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4137967/) and menopause as 51 (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2922699/).
A 48 year old woman, if still having an active menstrual cycle, can get pregnant. However, there are risks of having a pregnancy at that age. Remember that all of the eggs that a woman has are present at birth. This means that a 48 year old woman has kept all of those eggs for her entire life, and that they have been exposed to all of the various stresses that people have over a lifetime. This can include the effects of medications, radiation exposure (which accumulates over time), and other considerations. As a result, the risk of birth defects increases with age of the woman. I strongly recommend consultation with a physician, including special consultation with a fertilization expert. Genetic counseling may also be of particular benefit to help you with family planning.
Finally, I would also espouse getting a triple screen done should a successful pregnancy happen. This will help you to identify some potentially devastating genetic defects well before birth, thus giving you options for family planning.