When cloudy vision and halos around lights are the symptoms, this can be an acute angle closure glaucoma attack, but without significant pain, redness, and usually nausea/vomiting, this is unlikely.
Her symptoms are likely related to her contact lens use. This may be an infection/inflammation causing cloudiness in the cornea. The redness supports this as a possibility.
This could also be some swelling (edema) in the cornea related to the contact lens use (sometimes this gets better later in the day without the contacts in, but sometimes lasts several days). The lack of pain and sensitivity to light seem to support this as a possibility.
Whether this is corneal swelling or an inflammation/infection in the cornea, she should see an ophthalmologist as soon as she can. Infections related to contact lenses can be aggressive. This may be common sense, but she should stay out of the contact lenses until seen by the ophthalmologist.
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DISCLAIMER: My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must be examined by your doctor.