Danke it's really helpful. The bottom line I found is, there are a two types of quietness
1). Quietness i.e. without voice, dead silence, or technically No sound= leise.
2). Quietness i.e. peace, calm, rest, unpacific = Ruhig.
Since you are just beginning German, it's understandable that her pronunciation of "ruhig" might sound strange. The "ig" is usually pronounced as she does. To some it may sound as "ru-ish", but the final "g" is not accented.