That means from the time she is married to Liam and already given birth to Dylan and Ellie. So the bath tub is most definitely in her house. It is not a memory of her with someone else.
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This image too is close to her mid 20's as she gave birth to Ellie at the age of 21. Ellie looks about 6-7 yr old to me here. So Sophia in this images might be 27-28.
The teaser should be before this time period so that means before Sam and his family moved away from the Parkers.
Now the new teaser has a title "somebody's watching you"
The only relation i can form with Sophia in the bathtub in her mid 20's to Sam's event is that before Sam and his family moved one of the days
maybe Sam accidentally saw Sophia naked in her bathroom.
Though it does seem a little far fetched since Sam might be around 4yrs old at the time. It is hard for me to believe this is actually Sam's memory because of his age at the time. So it really is quite the suspense as to why we are seeing Sophia's image from her mid 20's. We are not even aware of her ever having any illicit relations outside of marriage. So it is quite confusing at the same time intriguing as to who this person who is watching her is.