First of all, an affidavit, despite being sworn, is an out-of-court statement and thus hearsay. Affidavits can serve as the basis for probable cause, but getting them introduced at trial as evidence is problematic because there is no way for an affidavit to be cross-examined.
For example, cops routinely write affidavits that go in a search warrant application, but at the trial they have to actually call the cop on the witness stand. They'd only be able to use the prior affidavit if there's an applicable exception to hearsay, such as a prior inconsistent statement for rebuttal purposes.
But regardless of all that, to charge her with constructive possession of the rest of the cocaine found in Nick's house, they don't need to prove that she moved out of her old address; they need to prove she moved in to the house with all the cocaine. If she lived there, there's a stronger argument that she had access to the cocaine that was found outside direct proximity to her immediate belongings.