Inverter Assembly and Hybrid Battery replacement

I became a first time Prius owner 4.5 yrs ago when my son had to upgrade to a 'family van' due to 3rd child coming. He gifted his '04 Prius to me - I moved from FL to NC to be near him and my grand kids.... less than a year later, my son was killed while riding his bike before work one morning.... I had lost not only my son but my main Prius consultant! Last week it threw codes while I was driving to work. I called the dealer and it was determined that IF it was running OK and I felt safe to do so, I could drive it the 2.5 miles back home which I did. I tried to start it later and the engine would not turn over. I had it towed to the dealer and after diagnostic, was told it needed a new inverter assembly for $5k. The car wasn't worth that except for sentimental reasons.... I searched and found repair shop that is certified and well experienced with hybrid cars - yeah! I decided to go the "used" part for the inverter assembly for $1600. I got a call today that the inverter only fixed part of the problem and that now the hybrid battery needs replaced which is quite pricey....

I don't know if it's wise to put nearly $5k total into an 04 Prius and was hoping some on here might have some sage advice for this frustrated and freaking out senior first time Prius owner.... In the Prius universe, does it make sense to invest this much in an '04 [mileage is 167k] or would it be advised to cut my loses and sell for salvage etc. Are there any other big money items that could go or are these two about it??

 

Thank you for the information and heads up!