I strongly suspect that nobody knows any more what freaked ... off means. It is obsolete sub-cultural (and possibly regional) slang. It has faded from usage completely. You will just have to make your best guess based on the context. My guess would be she really loved it.
A pad is still understandable. It is an apartment or home, or at least it used to mean that back in the 50's and 60's. Equivalent current slang would be a crib.
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