The night it happened there was speculation that the slurred speech was because she was under the influence (which sadly has happened before with stuff like this), it was only afterwards that it became known it was a stroke.
BNM, there are conflicting reports. While she wasn't hospitalized, that doesn't mean there wasn't medial issues. The folks at WebMD (who are knowledgeable on this kind of stuff) say that based on her symptons that she may have suffered a Transient Ischemic Attack, or transient stroke, which results in a temporary loss of blood to the brain but the patient is fine afterwards.