Welcome @musicmom !

Well - I don't best know - "where abouts were you before" in your lifetime-learning- journey with the violin ?   I know nothing about "levels" ( as in ABRSM etc etc ) and don't have enough years remaining to go down that path LOL !!   I'm a (very) late starter ( soon to be 3 years ) - but I play for fun and pleasure.  I'm "old" ( LOL ) and have a good grasp of music theory - and have as an amateur musician, played guitar and other instruments for many years.   Although completely different instruments - the "basics" behind them are all connected by the basic physics and math that makes music "what it is" - so I feel my progress on the "devil's-own-instrument" has been, to some degree, reasonable.

Having played before - you obviously don't need to be told to practice scales etc, or to work on really simple tunes...   I don't know how to help really..... Thinks.... OK maybe this - 

(1) You suggest you've played violin before - so get re-familiarized with the fingering ( OK, that would be scales, modes, chromatic scales etc etc.  The general structure of music, regardless of instrument. Get familiar with that once again - then play scales in as many keys and modes as you like until you're happy.  Use your ear! As a previous player - you'll surely appreciate how important the ear is on a fretless instrument - let that be your judge )   Get your intonation back to where it once was!

(2) I'm self-taught - but again - there are many studies/etudes out there - which for you as a previous player - you must or probably know about - I would re-visit them ( if you are a committed sheet-reader and that's how you originally learned to play - I'm not a "committed" sheet-reader - I play mostly by ear - but that's another story )

(3) It all goes back to your one-liner post where you say - "haven't played in years" - maybe you are like me - just picked it up on your own ?   Don't know - but if you have - then - I would ignore what I said above, and step back, and imagine you are starting from scratch - follow the lessons and tutorials (lots of nice, easy, well walked through examples - both on sheet and video by Pierre - aka Fiddlerman ) 

Best wishes and good luck on your return to fiddling !