I have some tiger barbs and angelfish. I really like them and definitely suggest the tiger barbs and if the angelfish are medium size I’d get them too. Hope that helps. Oh and I would not get goldfish again because they tend to try to eat all the food in the tank, get fat, and then die.

One male betta or a group of very small shoaling fish or maybe three male guppies. Plant the heck out of the tank to create a real showpiece. Ten gallons isn’t enough room for a lot of fish. “Several” is too many.

I prefer male guppies they have nice fan tails and are easy to up keep perfect for a busy teen

I am not surprised the goldfish died. common goldfish need 50 gallons minimum

In a 10 gallon coldwater tank you could have a few white cloud mountain minnows (up to 8 but no less than 6)

If you get an aquarium heater you could have any of these options

A:
1 betta (they dont normally attack other fish)
3 corydoras catfish
1 apple snail

B:
1 betta
6 glolight/neon/(other small non nippy) tetras

C:
6 glolight/neon/(other small non nippy) tetras
3 corydoras

D:
1-2 male guppies
1 male swordtail
1 male molly
1 male platy

E:
6 ember tetras
3 guppies

F:
8 various fancy male guppies

EDIT:
a 10 gallon is too small for energetic danios
and
most algae eaters such as plecos grow way to big for a 10 gallon

cold water or tropical ??

Cold water :
5 cold water zebra danio, 5 cold water pearl danio < energetic and very fun to watch

Tropical :

1 male Betta, 6 cardinal tetra and maybe a algae eater exellent mix of fish especially the guppy with the long flowing tail.

NOTE
it is cruel to keep betta in a cold water fish tank. Althought they will live, it isnt healthyand they wont thrive, Beta come from warm swamps near thailand so they arent used to the cold ! trust me

if you get a heater you can get some tropical fish. Get some friendly tetra’s like neons. if you get a school of neons and then a few other small fish that would look really cool

Only one beta if you get one. The males are territorial and aggressive with other fish of their species. Try a couple of zebra fish (cool stripes), and a plecostamus (I probably spelled that wrong-a sucker fish that will eat algae off the side of the tank). You will need a heater, though-they are tropical.

Well, do you have a heater? If so here are some options:
If she would like to see babies then platies and guppies. Guppies breed rapidly though!
Corys Are a very nice bottom feeder.
Neon tetras look nice.
Bettas work too depending on what fish you have.
Harlequin rasboras are nice too.
Stay away from tiger barbs, loaches, plecos, danios and gouramis. Barbs and danios you shouldn’t get, because they nip. Some danios are better than others. I have danios with my betta and they are fine, but the next person’s danios might have killed a betta. The other ones get too big.

Moors are funny-looking, but very cute and friendly. There’s also different types of goldfish, but either way you should try to get bottom-feeders (fish or snails) so that the tank stays clean even with a filter.

BETTA

they are good with tetras