Well, if she's been passing decent sized clumps, that's a start. And recently too.
But I can relate to your anxiety, having one constipated cat myself -
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These are our expurriences ... yes, holy s*it!
I can definitely recommend lactulose, even if it doesn't have an immediate effect ... as Mouse and I found out. It's available from Amazon, no script needed. Mouse takes it happily in Lick e lix or soup. You CAN syringe it into the cat but I can promise you'll both end up wearing more of the stuff than goes into the cat.
How old is your little guy? Many cats, as they age, lose muscle tone round the anus, and it gets harder and harder (yes, the brown stuff as well) to eject the stool ... bleaaagh.
I wouldn't be too worried if she's passed a motion today - I have a cat of 7 who passes a great healthy stool (The Pile) every couple of days. Mouse doesn't pass much at all ... but she's bright and hungry and she's going to surprise me again. But I would be worried about your girl's lack of appetite, which (worst case scenario) could indicate some underlying problem, of which the constipation could be a symptom, and frankly I'd have her back to the vet, truly, despite finances, not for another enema, but she may be dehydrated, which is a crisis situation - or ring your vet and ask for advice on how to deal with dehydration (home remedy is saline-glucose - teaspoonful of salt dissolved in pint of water with tsp glucose or honey and gently syringed into cat - but there are more sophisticated and efficient ways of restoring electrolytes - truly I would consult your vet - many vets will let clients pay by instalments or even just give advice over the phone.)
Hope others come by with more advice but hope this helps for now - please keep in touch and good luck and fusses to your little girl!