Absolutely! take her as soon as you can!!
Gizmo is 3.8 yrs old and never had any problems with him, until I changed his food... unaware of the measures that need to be taken to avoid any problems... I drastically changed his food to the Eukanuba Yorkshire Breed Specific food & 3 wks later was vomiting with specs of blood... He'd developed an intestinal infection, due to the change... I felt so ignorant and at the time had no YT support... If its not that Gizmo is a beautiful healthy big boy(11 lbs.), we would've lost him... He's now back to normal, he was treated with r/d prescription Hills Diet.
Hope
Gigi gets well soon!