Yes sure she can, DUI is nothing , unless she committed a big crime this is what CIC says
will not be eligible to sponsor you if were convicted of an offence of a sexual nature, a violent criminal offence, an offence against a relative that results in bodily harm or an attempt or threat to commit any such offences—depending on circumstances such as the nature of the offence, how long ago it occurred and whether a record suspension (formerly called “pardons” in Canada), was issued (See Sponsorship Bar for Violent Crime below)