Yes, could be. The script-writers have certainly been careful to set up plenty of 'loose space' around what's actually happening on screen for the sake of audio adventures and spin-off novels - hence e.g. the reference at the beginning of Rosa (I think) to the Doctor having tried fourteen times to get them all home and still not quite managing it. But I'd like this particular question to be made a bit clearer, because the same reference I've just mentioned also suggests the Doctor isn't really well enough in control of the TARDIS to keep getting them home to the same place reliably, and Yaz must have known that when she made the choice to keep travelling with her at the end of the Arachnids story. Has the Doctor now managed to pin the TARDIS reliably to that particular point in time and space so that she can keep on returning to it whenever she wants to not, or not? It matters quite a lot either way for how we understand the companions and how much control they have over their travels.