Cats are often constipated because of hair balls or because perhaps the
owner has fed them things like milk or cheese.  Many cats will vomit out
their hair balls regularly.  It may look like poop, but it's really
hairballs.  If your cat gets into trouble for vomiting she may supress that
and become constipated instead, so don't ever yell at her for vomiting,
especially if she's a long haired cat!  They need to vomit every couple of
days and will often force themselves to do so by eating grass if it's
available.  So you might want to let her run in your yard for a few minutes
each day.  Cats, like humans, do need vitamin D each day anyway, to prevent
cancer and worse, and sunlight is a great way to get it.  But don't leave
your cat on a leash unattended as it could harm itself or be attacked.

You can purchase cat grass at pet shops and grow it in a pot.   Cats love
plain and simple QUACK grass in your yard though.

Lots of cats also like things like canned corn which may help as well.
Avoid giving any constipated cat milk or cheese.  Most older cats tolerate
water better anyway.

Don't ever let your cat's dish run low in water, and change it daily.

Put the water in a glass dish -- not a plastic one, as a lot of cats get a
type of fungus under their chin (little black spots) from plastic dishes.

If you're feeding your cat dry food, try giving her wet food for a change.
Most cats love changes in texture now and then just as humans do, and the
extra water in the wet food may help.  Your poor kitty does need assistance
because if this continues she could develop painful hemorrhoids and be in
pain for life.

My cat in particular loves the brands of Friskies that have the word
SHREDDED on them.  The word isn't easy to spot so you have to look for it.
She goes crazy over the gravy part, but she does have a sensitive stomach so
I can't feed her more than a spoonful at a time, a few times a day.

Vets sell a wonderful product also (and sometimes you can also buy it on the
store shelves) for helping cats get rid of the hair in their stomach.  Some
cats are fussy and don't like the stuff though.  If that's the case, try
putting even a small pat of butter on the side of her plate, like maybe a
small fingertip full each day.

A lot of cats are finicky, like some humans and can't stand a dirty litter
box, which will make them hold themselves as well.   Most also like their
litter boxes in a private place, just like you like your toilet in a private
place.  They don't like being watched while going to the bathroom anymore
than you do.

All in all, there's a lot you can do to help her out.
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