What makes me think she has no actual memory of February 4th is that in their jailhouse discussion, this February, after he tells her about his phone picking up towers near Riverside at 9.32 you can't really hear her side of the call but he's saying to her 'would you have had my phone?' and 'no, I phoned you, you were at home', so it seems to me as if she's saying she remembers being in that area at some point around that time.
Hopefully the jurors' transcript is complete with both their comments and not just Chase's because I think Ryan Smith said he placed recording devices on both sides of the glass.