While she hated seeing her stable star go through such a tough time, the long spell that followed not only cured Double Rocket but gave him time to strengthen and if he stays sound he looks a worthy addition to the northern open-class ranks.
"I think, for all he has been through, he has come out of it a stronger and better horse. His work the other day was his best in two years, if not the best he has ever worked."
Double Rocket resumed from his 15 months on the sidelines in the Uncut Gems race at Alexandra Park two weeks ago, hitting the line strongly in fourth.
"I was absolutely ecstatic with how he went fresh-up and it has definitely brought him on fitness-wise."
As good as the 5-year-old is, he meets some race-hardened rivals of equal ability tonight. Perhaps more worrying for backers will be his hit-and-miss standing-start manners.
"He is iffy at the start," admits Donnelly. "If and when he steps he can make a flyer but when he misses it he can be a real bugger so that is the concern this week."
Double Rocket can't afford to give his key rivals a start, especially Hot And Treacherous, who he shares the 10m mark with in the 2700m event.
Hot And Treacherous has risen to a new level in recent starts and was a luckless second last start after a booming run-of-the-race third in the 3-year-old Emerald at the Jewels.
While he faces a tricky inside draw, if he can stay in front of rivals like Double Rocket and Plutonium Lady he looks the one to beat.
Donnelly also has the in-form Rough And Ready jumping sharply in class in the Winter Cup, while Wet Flipflops in race nine has a chance to extend her trainer's personal best season, which sits at 35 wins.
While the Winter Cup is the undoubted highlight, many will want to see if I See Fire (R8, No 8) can make it three wins on end as he shapes up as a future open-class trotter, while an open-class trotting star in Temporale (R10, No 6) faces a 30m backmark in the last race of the night.