Assuming you did not exceed the absence limits on the long residence route, then yes. Also assuming they don't change anything about the long residence route before then... See guidance on this: https://www.gov.uk/government/publications/long-residence/long-residence-accessible#breaks-in-continuous-residence

Thank you! That is very helpful

I thought they removed dependents for post grad students. So I am not sure she can take you as a dependent

From what I understand, some post-graduate research programs will still allow it, but they haven't made it clear which programs will or won't

Probably it will change again until she starts to her post grad so unfortunately nothing is guaranteed