Radharani's inseparable nature from Krsna:
The internal potency of the Lord and the Lord are non different. I'll say it again: The internal potency of the Lord and the Lord are non different. The Lord and His potency are non different, just like the sun and the shine of the sun are non different. You're not going to find the shine without the sun, nor the sun without the shine. Similarly, you're not going to find Srimati Radharani without Krsna, or Krsna without Srimati Radharani.

Radharani's qualities:

There is only one thing in the heart and the mind of Srimati Radharani, and that is serving and pleasing Krsna. Because of this unequaled love that Radha has for Krsna, Radha steals the heart and the mind of Krsna. When we say "Radha" in the vocative form, it becomes "Radhe". Similarly, "Hara" in the vocative form becomes "Hare". "Hara" is the internal potency of the Lord, who is none other than Radha. While chanting our maha-mantra, we pray, “O Supreme Goddess Radha, You who steal the heart of Krsna, please engage me in the service of the Supreme Lord, Krsna”.