Yeah but she doesn't get any more healing spells than Clerics (aside from Goodberry, which is actually decent early on but really not worth the spell slot) while missing out on many Cleric spells. Summon Animals is okay but hugely inferior to Animate Dead - and besides, Clerics get Summon Animals as well, so if you prefer it, you're golden.
Call Woodland Creatures is the Druid-specific summon spell, and I don't think it's even available until BG2
Jaheira fills a specific role, and she does it well:
Druids == Superior Debuff/Debilitate, Offensive, Summon spells.
Clerics == Superor Buff/Heal, Turn/Summon Undead
Jaheira is a multiclass Fighter/Druid. You do the math!
If this were BG2, you'd have a point. But it isn't. Druids have actually got inferior summon spells, the only debuff/debilitate they get that Clerics don't is Hold Animal (whooo), while in fact Druids miss out on spells like Hold Person.
Really the only notable spell Druids get that Clerics don't is Call Lightning, and that's only usable outdoors - and how many difficult outdoor fights are there once you're level 5? Aside from that it's crap like Goodberry.
In fact, here's something worth noting:
There are NO Druid-specific spells after level 3.
The entire list of Druid-specific spells in TotSC is:
Charm Person or Mammal
That's a grand total of FOUR spells, two of which I never use (Hold Animal and Goodberry, though the latter CAN be useful), one of which is decent but more or less the same as a Mage level 1 spell (Charm), and Call Lightning. Meanwhile, they're giving up nearly HALF the spells available, which are Cleric-only. Many of them are among the better spells, too (Command, DUHM, Animate Dead, Defensive Harmony, Flame Strike, etc).
If this were BG2 or Tutu, then it'd be a whole different story. But vanilla TotSC? Druids are complete crap compared to Clerics.
Jaheira's fighter levels are nice, but are they good enough to be worth slowing down her spell progression? Probably, actually. If you use her as a Fighter with healing capabilities, she's not bad at all. But especially for a newbie (as per OP)? You've got better options. If you want a divine caster, Branwen and Viconia are far better bets. The other clerics come too late.
The best cleric is probably slapping a tome of WIS on Xzar and dual-classing him, but again, that might not be a great route for a newbie to go.