Battery draining fast

I must say your daughter has excellent taste in cars! So many of her age would want something from Japan.

The fusible link is a small #16 gauge blue wire between the 5/16" battery stud on the starter relay and one of the bulk head connector pins. It may have a small molded tag on it labeled fuse or link. This wire is covered with a special high temperature insulation and is meant to act as a last resort fuse that is supposed to melt open in case of a short circuit to hopefully prevent a fire. They can fail by corrosion under the insulation and look okay so you really need to check them with a meter. They can also melt open and appear okay from the outside.

I prefer to replace them with a 50 amp Maxi-Fuse in a separate holder. A Maxi-Fuse is a more modern blade type fuse used on newer cars. They are widely available and once you get the proper holder installed very easy to replace if need be.