Adding link:
https://www.flickr.com/photos/lipikab/13320696964/

Did you happen to use any product on the lawn recently? Some round up anywhere?

Being in California, Rose Rosette Disease is something found on the other side of the rockies, thank goodness and lets hope it stays away. Or did you mean Rose Mosaic Virus?

Any Gophers in your garden? Or different fertilizer used?

It doesn't look like Rose Rosette Disease to me. But what it is, I have no idea. It looks like you had some healthy new growth and something suddenly happened like cold weather or some chemical.

Did you at any point in the early development have a sudden cold snap or any kind of strange weather? That could cause peculiar growth patterns. It doesn't seem to look like RRD to me.

I wonder if the roots are gone. A critter may have chewed them or they may have rotted off.

RRV tends to look like bizarre, accelerated growth. Your plant looks more like it needs water. Or, as Henry suggests, it has no viable roots

RRV
{{gwi:244501}}

I missed the memo that RRD is now called RRV. Oh Well....Harry's picture is pretty much how all of my RRD infected roses looked with the over production of rubbery thorns being the first obvious indicator.....Maryl

drip system clogged? looks like it died of thirst. check how moist the soil is after running the drip system. standard ("tree") roses are easier to kill, too.

Whoops! Yeah. Its RRD.