Thanks for the query.
As any infection during pregnancy
can affect the general health of the mother and there by baby health, it should be treated carefully.
Better to consult gynecologist, get examined and take antibiotics and antitussives.Home remedies
can also be used.
She can keep two pillows to elevate the head end that can help in receiving the breathing problem to some extent.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429