I highly recommend a Kong for her, my dogs love their's. A good long walk before leaving her will do more good though than a toy as it will tire her and encourage her to sleep. I don't know how long you leave her? If more than 3 to 4 hours try and arrange someone to come in and take her for a quick walk or playtime.
The following below is taken from my ols Chihuahua site, hope it might help
The Kong is a strong, hollow, rubber-type dog toy designed to be filled with food and treats. Its aim is to keep your dog amused while left alone or while you are unable to spend time with him. Kongs may be bought at most pet shops and come in a variety of sizes, the smaller ones are most suitable for toy dogs and a good pet shop should be able to advise.
Information on safe usage is available on the products packaging. Do read carefully before use.
Recipes for Kong Stuffing!
Kongs need a combination of three types of fillings:
Difficult to work out
Chopped chicken skin (Honeys favourite)
Fish or meat paste (Jago loves these!)
Take time to work out
Dog biscuits wedged into place
Pieces of bite-sized carrot
Small, bite-sized pieces of cooked liver or heart (or any oddly shaped piece of food which are safe to feed)
Come out very easily
Part of pup’s daily diet of complete puppy food.
Small, regular shaped dog treats.
Never put anything into the Kong that you would not normally feed your Chihuahua.
Cut pieces of meat into bite-size portions, larger than this and your dog could choke.
The Kong is ideal to use when you have to go out and leave your Chihuahua for a little while.
The Kong is best used on an occasional basis rather than given everyday. When not being used in this way, it makes a great toy.
All that chewing is thirsty work, so do ensure that fresh water is always available.
Some fillings may mark carpets or furnishings so keep this in mind.
Wash thoroughly with hot soapy water after use, rinsing well before leaving to dry - a small bottle brush is useful for reaching and cleaning the inner grooves.
I find using the handle of a small teaspoon ideal for packing the Kong, it helps you press the filling right into it. There are several sizes of Kong available, not surprisingly the smallest one is best suited to toy dogs.
Honey and Jago’s favourite Kong recipes
TASTY TUNA & CHEESE
Begin by placing a small amount of low fat cream cheese in base of Kong, about half a teaspoonful.
In a small bowl, mix a little Tuna and wholemeal bread crumbs, add to Kong, leaving enough room to allow you to seal top hole with a coating of cream cheese.
Very popular this one, but can be messy, though Chi’s are quick to clean it up!
YANKEE DOODLE DELIGHT
Firstly place about half a teaspoon of smooth peanut butter in the bottom of the Kong.
Chop up a small piece of hot dog or hamburger and mix with your pets usual kibble, moist food or small bite mixer. Seal hole at top with a thin layer of the peanut butter.
Again, place cream cheese in bottom of Kong. Cook Ox heart, when cold, chop into small pieces.
Soak a small amount of wholemeal bread in the water that you cooked the heart in. Remove from pan, squeezing out as much excess fluid as possible.
Pack the Kong tightly with the moist bread and heart.
Seal the hole at the top with another layer of cream cheese.
BACON & EGG BOMB
If you are preparing a cooked breakfast for yourself, why not treat your Chihuahua to a taste?
Put this in his Kong and I guarantee, well almost, that you’ll be able to enjoy your breakfast in peace!
Soft boil a small free range egg. Lightly toast a slice of wholemeal bread, cutting approx quarter of a slice into very small, Chi-bite-size pieces.
Using a fork, mash the egg in a small bowl, mix in the toast pieces and a little lean grilled bacon, again finely chopped.
If you wish, you can add a few pieces of dry kibble.