Yeah I think you should deffo get a pen for her.
I have Poppy in her pen with her bed and toys at one end and her pad at the other.
At least then you can leave the room and you know exactly where she is and that shes safe.
It also means you know where the pee's and poo's are incase she misses the pad so your not finding presents all over the house!
As another member mentioned, you should never put a lead on her collar when you walk her as this can cause a collapsed trachea.
Its ok to let her wear her collar so she has her ID tag on but when walking her attach her lead to a harness.
And yes an enzyme cleaner comes in VERY helpful
Congratulations on your new pup, remember if you see her doing the potty dance STRAIGHT on the pad and praise her lots and lots when she goes potty in the right place.
Never tell her off if you find a present in the house because she wont know what she is getting wrong for, ONLY tell her off when you catch her in the act then put her straight on the pad
Good luck.